Reserve guard James Harden scored 26 points on just 12 field-goal attempts. He also had six rebounds, four assists and two steals.
Harden came up big in the final minute of overtime, converting a conventional three-point play, which was followed by a steal just 5½ seconds later.
Serge Ibaka had 15 points, seven rebounds and four blocked shots. “Serge had some great blocks,” Gentry said.
Reserve forward Nick Collison had 11 points and nine rebounds, while guard Daequan Cook added eight points in 19 minutes.
“Everybody chipped in today,” Durant said. “Russell, Serge and James picked it up for me. It was a great win for us. We grinded it out.”
The three players who came to Phoenix in a trade with Orlando on Dec. 18 torched the Thunder for 69 points (10 for 18 from 3-point range), 13 rebounds, eight assists and three blocked shots.
In two games against the Thunder, guard Vince Carter is averaging 31.0 points and is a combined 12 for 24 from 3-point range. He had a team-high 29 points Sunday and swished a 3-pointer with 9.2 seconds left in regulation to tie the score at 109 and force overtime.
Center Marcin Gortat had 20 points, eight rebounds and three blocks, while wingman Mickael Pietrus had 20 points and went 4 for 6 on 3-pointers.
OKC is now 3-8 on Sundays and 6-1 in overtime this season.
The Thunder (39-22) plays tonight at Memphis (35-29), which won 104-103 at Dallas on Sunday night after overcoming a 55-38 halftime deficit.
Sunday's box score