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Liam O'Brien
| Position | Left Wing / Right Wing | Current Team | Utah Mammoth |
| Shoots | Left | Current Contract | 3 years |
| Height | 6'1" | Expires | 2026-27 |
| Weight (lbs) | 215 | Expiry Age (Jun 30) | 32 |
| Age | 31 (July 29, 1994) | Expiry Status | UFA |
| Drafted | Undrafted |
| Date | Team | Transaction | |
|---|---|---|---|
| Oct 6, 2025 | Utah Mammoth | Placed on IR | |
| Jun 26, 2024 | Utah Hockey Club | Signed 3 years @ $1.000M AAV starting in 2024-25 | |
| Mar 6, 2022 | Arizona Coyotes | Signed 2 years @ $775K AAV starting in 2022-23 | |
| Jul 28, 2021 | Arizona Coyotes | Signed 1 year @ $750K AAV starting in 2021-22 | |
| Mar 30, 2021 | Colorado Avalanche | Signed 1 year @ $700K AAV starting in 2020-21 | |
| Jun 10, 2019 | Washington Capitals | Signed 1 year @ $700K AAV starting in 2019-20 | |
| Jul 13, 2018 | Washington Capitals | Signed 1 year @ $650K AAV starting in 2018-19 | |
| Jul 14, 2017 | Washington Capitals | Signed 1 year @ $650K AAV starting in 2017-18 | |
| Oct 5, 2014 | Washington Capitals | Signed to an entry level contract. |
Status History Coming Soon
5v5 Individual Stats
| Season | Team(s) | GP | TOI | G/60 | A/60 | Pts/60 | xG/60 | GAE/60 | Sh% | xSh% | Sh%AE | %SA Rush | %SA Reb. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2016-17 | WSH | 1 | 6:08 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | - | - | - | - | - |
| 2017-18 | WSH | 3 | 20:32 | 0.00 | 0.00 | 0.00 | 0.04 | -0.04 | 0.00 | 1.47 | -1.47 | 0.00 | 0.00 |
| 2020-21 | COL | 12 | 77:39 | 0.00 | 2.32 | 2.32 | 0.40 | -0.40 | 0.00 | 8.60 | -8.60 | 0.00 | 0.00 |
| 2021-22 | ARI | 39 | 359:03 | 0.33 | 0.17 | 0.50 | 0.60 | -0.27 | 5.71 | 10.31 | -4.60 | 2.00 | 12.00 |
| 2022-23 | ARI | 56 | 578:38 | 0.31 | 0.73 | 1.04 | 0.34 | -0.03 | 8.33 | 9.24 | -0.90 | 0.00 | 3.85 |
| 2023-24 | ARI | 75 | 695:36 | 0.43 | 0.78 | 1.21 | 0.56 | -0.13 | 7.04 | 9.14 | -2.10 | 5.05 | 7.07 |
| 2024-25 | UTA | 28 | 257:29 | 0.00 | 0.47 | 0.47 | 0.90 | -0.90 | 0.00 | 11.41 | -11.41 | 3.77 | 5.66 |
5v5 On Ice Stats
| Season | Team(s) | GP | TOI | SAF/60 | GF/60 | xGF/60 | SAA/60 | GA/60 | xGA/60 | GF% | xGF% | xGF Rel | xGA Rel | xGF% Rel |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2016-17 | WSH | 1 | 6:08 | 68.48 | 0.00 | 4.02 | 48.91 | 0.00 | 0.68 | - | 85.62 | 1.87 | -1.37 | 34.38 |
| 2017-18 | WSH | 3 | 20:32 | 26.30 | 0.00 | 0.92 | 37.99 | 0.00 | 2.55 | - | 26.48 | -1.51 | 0.30 | -25.40 |
| 2020-21 | COL | 12 | 77:39 | 40.18 | 2.32 | 2.40 | 39.41 | 1.55 | 1.70 | 60.00 | 58.61 | -0.31 | -0.49 | 3.19 |
| 2021-22 | ARI | 39 | 359:03 | 30.08 | 1.00 | 1.71 | 46.79 | 1.00 | 2.70 | 50.00 | 38.81 | -0.49 | -0.01 | -6.04 |
| 2022-23 | ARI | 56 | 578:38 | 28.20 | 1.66 | 1.68 | 43.24 | 2.38 | 2.61 | 41.03 | 39.15 | -0.63 | -0.29 | -5.19 |
| 2023-24 | ARI | 75 | 695:36 | 34.42 | 2.33 | 2.05 | 43.21 | 2.07 | 2.38 | 52.94 | 46.18 | -0.50 | -0.27 | -2.76 |
| 2024-25 | UTA | 28 | 257:29 | 41.48 | 2.10 | 2.28 | 40.55 | 1.63 | 2.17 | 56.25 | 51.18 | -0.33 | -0.00 | -3.36 |
NHL Edge Stats
| Skating | Shooting | Zone Time | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | GP | Top Speed | Bursts>20/mi | Avg. Speed | ES Avg. Speed | Top Speed | Avg. Speed | %Long Range | %Mid Range | %High Danger | ES DZ% | ES NZ% | ES OZ% |
| 2021-22 | 39 | 21.4 | 0.4 | 9.7 | 9.7 | 85.1 | 54.7 | 7.4 | 51.9 | 40.7 | 0.4 | 0.2 | 0.4 |
| 2022-23 | 56 | 22.2 | 0.4 | 9.6 | 9.6 | 81.3 | 54.5 | 27.3 | 51.5 | 21.2 | 0.4 | 0.2 | 0.4 |
| 2023-24 | 75 | 21.9 | 0.6 | 9.6 | 9.6 | 81.8 | 52.1 | 17.0 | 38.3 | 44.7 | 0.4 | 0.2 | 0.4 |
| 2024-25 | 28 | 22.2 | 0.7 | 9.8 | 9.8 | 82.0 | 49.3 | 11.1 | 44.4 | 44.4 | 0.4 | 0.2 | 0.4 | 2025-26 | - | - | - | - | - | - | - | - | - | - | - | - |
Legend
| Percentile 0-25 | Percentile 25-50 | Percentile 50-75 | Percentile 75-100 |
5v5 Lines
Season
| Season | Teammate | Teammate | Team | TOI | GF/60 | GA/60 | GF% | xGF/60 | xGA/60 | xGF% | xGF Rel | xGA Rel | xGF% Rel |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024-25 | UTA | 2.73 | 1.82 | 60.00 | 2.05 | 2.08 | 49.60 | -0.78 | -0.09 | -6.98 | |||
| 2024-25 | UTA | 1.38 | 1.38 | 50.00 | 2.28 | 1.68 | 57.62 | 0.04 | -0.52 | 7.18 | |||
| 2024-25 | UTA | 0.00 | 1.49 | 0.00 | 2.16 | 2.53 | 46.05 | -0.35 | 0.37 | -7.70 | |||
| 2024-25 | UTA | 3.74 | 0.00 | 100.00 | 2.98 | 1.62 | 64.84 | 0.27 | -0.83 | 12.30 | |||
| 2023-24 | ARI | 2.94 | 1.76 | 62.50 | 2.18 | 2.63 | 45.32 | -0.30 | 0.21 | -5.28 | |||
| 2023-24 | ARI | 2.49 | 2.49 | 50.00 | 1.73 | 2.71 | 38.97 | -0.66 | 0.03 | -8.20 | |||
| 2023-24 | ARI | 4.31 | 1.72 | 71.43 | 2.09 | 2.20 | 48.67 | -0.55 | -0.36 | -2.07 | |||
| 2023-24 | ARI | 0.93 | 1.87 | 33.33 | 2.28 | 2.50 | 47.70 | -0.26 | -0.11 | -1.61 | |||
| 2023-24 | ARI | 0.00 | 0.00 | - | 1.82 | 1.23 | 59.73 | -1.30 | -1.89 | 9.69 | |||
| 2023-24 | ARI | 2.56 | 2.56 | 50.00 | 1.18 | 2.37 | 33.32 | -0.82 | -0.45 | -8.23 | |||
| 2023-24 | ARI | 2.64 | 0.00 | 100.00 | 2.45 | 2.97 | 45.27 | -0.61 | 0.07 | -6.13 | |||
| 2023-24 | ARI | 0.00 | 2.65 | 0.00 | 1.87 | 1.80 | 50.86 | 0.07 | -0.86 | 10.58 | |||
| 2022-23 | ARI | 3.22 | 2.26 | 58.82 | 1.60 | 2.47 | 39.38 | -0.62 | -0.39 | -4.33 | |||
| 2022-23 | ARI | 1.23 | 2.46 | 33.33 | 1.85 | 2.43 | 43.27 | -0.39 | -0.46 | -0.43 | |||
| 2022-23 | ARI | 1.09 | 2.19 | 33.33 | 1.28 | 3.32 | 27.81 | -1.16 | 0.48 | -18.39 | |||
| 2022-23 | ARI | 0.00 | 0.00 | - | 1.95 | 2.50 | 43.77 | -0.08 | -0.48 | 3.33 | |||
| 2022-23 | ARI | 0.00 | 7.54 | 0.00 | 1.29 | 3.39 | 27.63 | -0.86 | 0.49 | -14.98 | |||
| 2021-22 | ARI | 0.00 | 1.36 | 0.00 | 2.24 | 4.46 | 33.39 | -0.17 | 1.27 | -9.58 | |||
| 2021-22 | ARI | 3.11 | 0.00 | 100.00 | 2.26 | 2.08 | 52.05 | 0.13 | -0.42 | 6.01 | |||
| 2021-22 | ARI | 0.00 | 2.02 | 0.00 | 1.83 | 2.20 | 45.38 | -0.32 | -0.13 | -2.60 | |||
| 2021-22 | ARI | 0.00 | 0.00 | - | 2.04 | 1.74 | 54.05 | -0.16 | -1.02 | 9.56 | |||
| 2020-21 | COL | 2.99 | 2.99 | 50.00 | 1.63 | 1.58 | 50.85 | -1.09 | -0.55 | -5.33 |
Glossary
| Type | Statistic | Definition |
|---|---|---|
| Individual | G/60 | Goals Against per 60 minutes. |
| Individual | A/60 | Assists per 60 minutes. |
| Individual | Pts/60 | Points per 60 minutes. |
| Individual | xG/60 | Expected Goals per 60 minutes. |
| Individual | GAE/60 | Goals Above Expected (G/60 - xG/60). |
| Individual | Sh% | Shooting Percentage. |
| Individual | xSh% | Expected Shooting Percentage. |
| Individual | Sh%AE | Shooting percentage above expected (Sh% - xSh%). |
| Individual | %SA Rush | Percentage of shot attempts determined to be on the rush. |
| Individual | %SA Reb. | Percentage of shot attempts determined to be from rebounds. |
| On Ice | SAF/60 | Shot Attempts For per 60 minutes. |
| On Ice | GF/60 | Goals For per 60 minutes. |
| On Ice | xGF/60 | Expected Goals For per 60 minutes. |
| On Ice | SAA/60 | Shot Attempts Against per 60 minutes (lower is better). |
| On Ice | GA/60 | Goals Against per 60 minutes (lower is better). |
| On Ice | xGA/60 | Expected Goals Against per 60 minutes (lower is better). |
| On Ice | GF% | Goals For Percentage = Goals For / (Goals For + Goals Against) |
| On Ice | xGF% | Expected Goals For Percentage = Expected Goals For / (Expected Goals For + Expected Goals Against) |
| On Ice | xGF Rel | xGF/60 when On Ice - xGF/60 when not On Ice. |
| On Ice | xGA Rel | xGA/60 when On Ice - xGA/60 when not On Ice (lower is better). |
| On Ice | xGF% Rel | xGF% when On Ice - xGF% when not On Ice. |
News and Opinions
-
Breaking Down the Utah Mammoth’s Opening Night Roster at The Hockey Writers (Tue Oct 7, 2025)
-
3 Takeaways From Mammoth’s 3-2 Loss to Kings at The Hockey Writers (Wed Oct 1, 2025)
-
Utah Mammoth’s 2024-25 Report Cards: Nick Bjugstad at The Hockey Writers (Sun Sep 28, 2025)
-
Biggest Questions Surrounding the Utah Mammoth Entering the 2025-26 Season at The Hockey Writers (Fri Sep 19, 2025)
-
NHL Teams Give Injury Updates On Bruins' Pastrnak, Leafs' Domi, Lightning's Paul And 10 Others at The Hockey News (Wed Sep 17, 2025)
-
Utah Mammoth’s rise should have the Blues watching their back at Bleedin' Blue (Mon Sep 15, 2025)
-
Utah Mammoth’s 2024-25 Report Cards: Liam O’Brien at The Hockey Writers (Fri Aug 22, 2025)
Current Contract
Standard Contract (UFA) ( ) (0 ratings)
Standard Contract (UFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-23 | 28 | $775,000 | $775,000 | - | - | $750,000 | $750,000 | $750,000 | UFA | ||
| 2023-24 | 29 | $775,000 | $775,000 | - | - | $800,000 | $800,000 | $800,000 | UFA | ||
| Total | - | - | $1,550,000 | $1,550,000 | $1,550,000 |
Standard Contract (UFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021-22 | 27 | $750,000 | $750,000 | - | - | $750,000 | $750,000 | $250,000 | UFA-Grp6 | ||
| Total | - | - | $750,000 | $750,000 | $250,000 |
Note: Guaranteed minimum salary is $300,000.
Standard Contract (UFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020-21 | 26 | $700,000 | $700,000 | - | - | $700,000 | $700,000 | $160,000 | UFA-Grp6 | ||
| Total | - | - | $700,000 | $700,000 | $160,000 |
Standard Contract (RFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019-20 | 25 | $700,000 | $700,000 | - | - | $700,000 | $700,000 | $212,500 | RFA-arb | ||
| Total | - | - | $700,000 | $700,000 | $212,500 |
Signed: June 10, 2019
Team: Washington Capitals
GM:
Brian MacLellan
Exp. Status: UFA-Grp6
Cap %: 0.86
Note: Guaranteed minimum salary is $237,500.
Standard Contract (RFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018-19 | 24 | $650,000 | $650,000 | - | - | $650,000 | $650,000 | $150,000 | RFA-arb | ||
| Total | - | - | $650,000 | $650,000 | $150,000 |
Signed: July 13, 2018
Team: Washington Capitals
GM:
Brian MacLellan
Exp. Status: RFA-arb
Cap %: 0.82
Note: Guaranteed minimum salary is $175,000.
Standard Contract (RFA) ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017-18 | 23 | $650,000 | $650,000 | - | - | $650,000 | $650,000 | $85,000 | RFA | ||
| Total | - | - | $650,000 | $650,000 | $85,000 |
Signed: July 14, 2017
Team: Washington Capitals
GM:
Brian MacLellan
Exp. Status: RFA-arb
Cap %: 0.87
Entry Level Contract ( ) (0 ratings)
| Season | Age* | Clause | Cap Hit | AAV | Perf. Bonus | Sign. Bonus | Salary | Compensation | Minors Salary | Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2014-15 | 20 | $621,667 | $641,667 | $20,000 | $55,000 | $550,000 | $605,000 | $70,000 | ELC | ||
| 2015-16 | 21 | $621,667 | $641,667 | $20,000 | $55,000 | $575,000 | $630,000 | $70,000 | ELC | ||
| 2016-17 | 22 | $621,667 | $641,667 | $20,000 | $55,000 | $575,000 | $630,000 | $70,000 | ELC | ||
| Total | $60,000 | $165,000 | $1,700,000 | $1,865,000 | $210,000 |
Career Statistics
| Regular Season | Playoffs | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | League | Team | GP | G | A | Pts | +/- | PIM | Shots | Sh% | TOI/G | GP | G | A | Pts | +/- | PIM | Shots | Sh% | TOI/G |
| 2009-10 | SMHL | Notre Dame Hounds Midget AAA | 41 | 13 | 25 | 38 | 98 | |||||||||||||
| 2009-10 | SMAAAHL | Notre Dame Hounds U18 AAA | 13 | 4 | 3 | 7 | 30 | |||||||||||||
| 2010-11 | QMJHL | Rimouski Océanic | 61 | 2 | 8 | 10 | -8 | 45 | 5 | 6 | ||||||||||
| 2011-12 | QMJHL | Rimouski | 40 | 7 | 9 | 16 | +4 | 67 | 46 | 1,520.0 | ||||||||||
| 2011-12 | QMJHL | Rouyn-Noranda | 27 | 3 | 7 | 10 | -17 | 69 | 45 | 670.0 | 4 | 1 | 1 | -2 | 11 | 6 | 1,670.0 | |||
| 2012-13 | QMJHL | Rouyn-Noranda | 65 | 10 | 14 | 24 | -12 | 164 | 111 | 900.0 | 12 | 2 | 1 | 3 | +2 | 17 | 18 | 1,110.0 | ||
| 2013-14 | QMJHL | Rouyn-Noranda | 68 | 20 | 15 | 35 | -11 | 148 | 180 | 1,110.0 | 9 | 1 | 3 | 4 | -2 | 12 | 24 | 420.0 | ||
| 2014-15 | NHL | Washington Capitals | 13 | 1 | 1 | 2 | +4 | 23 | 16 | 6.2 | 7:33 | |||||||||
| 2014-15 | AHL | Hershey | 45 | 4 | 4 | 8 | -5 | 121 | 55 | 730.0 | 10 | 3 | 3 | 6 | +1 | 14 | 18 | 1,670.0 | ||
| 2015-16 | AHL | Hershey | 59 | 7 | 9 | 16 | +2 | 120 | 85 | 820.0 | 20 | 4 | 2 | 6 | -5 | 65 | 26 | 1,540.0 | ||
| 2016-17 | NHL | Washington Capitals | 1 | 0 | 0 | 0 | 0.0 | 6:08 | ||||||||||||
| 2016-17 | AHL | Hershey Bears | 64 | 10 | 20 | 30 | +5 | 117 | 6 | +2 | 13 | |||||||||
| 2017-18 | AHL | Hershey Bears | 69 | 17 | 9 | 26 | -8 | 79 | ||||||||||||
| 2017-18 | NHL | Washington Capitals | 3 | 0 | 0 | 0 | 5 | 1 | 0.0 | 6:55 | ||||||||||
| 2018-19 | AHL | Hershey Bears | 74 | 15 | 13 | 28 | -12 | 118 | 8 | 1 | 1 | 21 | ||||||||
| 2019-20 | AHL | Hershey Bears | 59 | 10 | 19 | 29 | +14 | 83 | ||||||||||||
| 2020-21 | AHL | Colorado Eagles | 12 | 4 | 4 | 8 | -1 | 15 | ||||||||||||
| 2020-21 | NHL | Colorado Avalanche | 12 | 0 | 3 | 3 | +1 | 40 | 6 | 0.0 | 6:34 | |||||||||
| 2021-22 | NHL | Arizona Coyotes | 39 | 2 | 1 | 3 | +1 | 106 | 36 | 5.6 | 9:29 | |||||||||
| 2022-23 | NHL | Arizona Coyotes | 56 | 3 | 8 | 11 | -5 | 114 | 39 | 7.7 | 11:26 | |||||||||
| 2023-24 | NHL | Arizona Coyotes | 75 | 5 | 9 | 14 | 153 | 72 | 6.9 | 9:44 | ||||||||||
| 2024-25 | NHL | Utah Hockey Club | 28 | 0 | 2 | 2 | +1 | 50 | 34 | 0.0 | 9:18 | |||||||||
| NHL Career | 227 | 11 | 24 | 35 | +2 | 491 | 204 | 5.4 | 9:42 | |||||||||||