The 24-year-old Westbrook missed the first game of his five-year NBA career on Saturday when the Thunder played the Houston Rockets.
Westbrook, a three time All-Star, averaged 23.2 points, 7.4 assists, a career-high 5.2 rebounds and 1.77 steals in the regular season.
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Los Angeles Lakers point guard Steve Nash and forward Metta World Peace will not play on Sunday against the San Antonio Spurs, according to twcsportsnet.com.
The Lakers were without Kobe Bryant (Achilles), Nash (hamstring), Steve Blake (hamstring) and Jodie Meeks (ankle) in Friday's loss in the best-of-seven playoff series.
World Peace went scoreless with no rebounds and one assist in 17 minutes of Friday's defeat. He was benched in the second half. He had fluid drained from a cyst in his left leg on Friday morning, but it is reportedly not related to the knee surgery he had in March.
San Antonio leads the series 3-0.
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San Antonio Spurs center Tiago Splitter will miss the rest of the team's first round playoff series against the Lakers with a sprained left ankle.
Splitter left Friday's victory over the Lakers and did not return because of the injury. After the game, he was unable to put any weight on the ankle.
Team doctors said Splitter will miss at least a week, meaning he will not be back until the second round.
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The Philadelphia 76ers announced they had completed the purchase of the operating rights of the Delaware 87ers, a team that will compete in the NBA's Development League.
The 87ers, a new team, will join the D-League in the fall.
The team's operating rights were previously owned by the Utah Flash, which took a hiatus two years ago.
The 87ers will play their home games at the Bob Carpenter Center, on the University of Delaware campus, in Newark, Delaware.
The team will be nicknamed the "Sevens."
The name 87ers refers to 1787, the year Delaware was the first state to ratify the U.S. Constitution.