Deron Williams exploded for 50 points on Tuesday in Istanbul and Besiktas Milangaz needed every one of them in a 105-94 EuroChallenge victory over BG Göttingen.
The point guard, one of the first NBA players to move to Europe during the NBA lockout, made 17 of his 23 shots from the floor.
Included in that were seven of 10 makes from three-point range.
Göttingen, who have been struggling this season, trailed 91-90 after their 23-year-old point guard Louis Dale buried a shot from the arc with 2:14 to go.
Williams went to the other end, though, and with the 24-shot clock winding down answered with a three-pointer.
Then with Besiktas on top 95-90 and 1:10 remaining, Williams struck again from the arc before going in for a lay-up on his team's next possession for a 100-90 lead.
The USA Olympic gold medal winner reached the 50-point plateau with a lay-up on a fast-break just 13 seconds from the end.
The most points ever scored by Williams in the NBA came in a 2010 when he played for Utah against Oklahoma City and poured in 42.
David Hawkins finished with 23 points for Besiktas, who improved to 3-0 in Group B.
Raymond Sykes led the Violets with 25 points and Kyle Bailey had 19.
The German club fell to 0-3 with the defeat.
Ergin Ataman, Besiktas coach:
"We have three wins ın three games and we're still leading the group. Deron was tremendous. The reason why we won the game is the ındıvıdual performances. But we can't be [too] happy about the win, because of the 94 points that our rivals scored."
Can Akin, Besiktas player:
"We played against the fastest and the most athletic team of the group. They are inexperienced but full of energy. We had a hard tıme in defence and we have to get better in that area."
Kyle Bailey, Göttingen point-guard:
"I am proud of our performance, Deron was unstoppable tonight. In the first half we were really great but in the second we couldn't keep this way."
Stefan Mienack, Göttingen coach:
"We played against one of the elite teams of Europe. They're absolute contenders for the title and they have great players. It's so hard to win agaınst a team in which Deron Wıllıams plays for."