Report: Tim Duncan to continue NBA career

San Antonio Spurs forward Tim Duncan has opted to play for an 18th season in the NBA after agreeing to take on the final year of his contract, according to a report.

The 38-year-old admitted that he was unsure that he would play on after winning the fifth NBA Championship of his career in his side's 4-1 series victory over the Miami Heat.

However, Duncan has exercised the $10.3m (£6m) clause to play on in the 2015 season to remain with Gregg Popovich's side, reports ESPN.

Duncan scored 77 points in five games against the Heat in the NBA Finals.