Carmelo Anthony reached the 25,000-point mark during the third quarter of Oklahoma City's game at Detroit on Saturday night.
The Thunder took a 54-40 lead into halftime, but Washington trimmed its deficit to a point in the third quarter before the Thunder rallied.
Averaging just 5.0 points and 4.7 assists in 26.7 minutes this season for the Thunder, Roberson is regarded as one of the best on-ball perimeter defenders in the entire National Basketball Association, often times being tasked with guarding the opposing team's go-to scorer.
After getting back on the right track recently, the 29-20 Thunder will now have to figure out how to replace Roberson.
The Oklahoma City Thunder (28-20) and Detroit Pistons (22-24) battle at Little Caesars Arena. Paul George, who was named to the All-Star team Saturday, scored 26 points, and Westbrook was impressive throughout.
Australian centre Thon Maker played 19 minutes for three points and five rebounds while Boomers guard Matthew Dellavedova contributed seven points, two rebounds and four assists.
Westbrook, on the other hand, had a near triple-double with 37 points, 9 rebounds, 14 assists, and two steals with only one turnover. "When those three are playing like that, you aren't going to be able to stop them, but we had to do a much better job of doing the things we could control". This is their first meeting since November 24th 2017, a game Detroit won by the score of 99-98 (Pistons rally from 15 down in 3rd quarter). For the Pistons, Reggie Bullock is questionable with a thumb injury.
Oklahoma City rattled off its eighth straight win Sunday with a 122-112 home victory over the 76ers.
Joel Embiid led Philadelphia with 27 points and 10 rebounds in a losing effort.