Tim Duncan 'leaning strongly' toward retiring

San Antonio Spurs center Tim Duncan is leaning strongly toward retirement, a decision that would end an illustrious 19-season NBA career, according to league sources.

Duncan has left team officials, close associates and friends with a strong belief he's preparing to make an announcement in the near future on his departure.

Duncan recently elected to exercise the $5.6 million player option on his 2016-17 contract.