Tracy McGrady announced his retirement from the NBA Monday, ending a 16-year career that included two scoring titles, seven All-Star appearances, injuries to his knee and back, and zero playoff series wins while he was leading the way. ‘‘Thank all of you who have supported me over 16 NBA seasons, 7 All-Stars, and countless exciting moments,’’ McGrady tweeted Monday morning. ‘‘Retiring from NBA. Stay tuned.’’ McGrady didn’t rule out continuing his career overseas, perhaps in China, where he played last season. McGrady was drafted by Toronto out of high school in 1997, became a star in Orlando, was traded to Houston in 2004, and also played for the Knicks, Pistons, Hawks, and Spurs. He averaged 19.6 points, 5.6 rebounds, and 4.4 assists per game in his career . . . Forward Ronnie Brewer said he has taken a physical to sign with the Rockets. The 28-year-old free agent told KRIV-TV of Houston that he has agreed to a two-year contract . . . Lamar Odom, who TMZ had reported Sunday was missing for 72 hours after a dispute with his wife, is at a hotel with friends who are helping him battle a drug problem, sources told ESPN. Odom’s agent, Jim Schwartz, confirmed Odom is not missing and that the 33-year-old free agent plans on playing in the NBA next season.