FRIDAY, 1:31pm: Diaw's agent, Doug Neustadt, confirms that his client is opting in, telling Adrian Wojnarowski of Yahoo! Sports (Twitter link) that the letter has been sent to the team.
THURSDAY, 8:25pm: Boris Diaw expects to opt in for the final year of his contract with the Spurs, a source tells Marc J. Spears of Yahoo! Sports (Twitter link). Diaw's 2013/14 player option would pay him a guaranteed $4,702,500 if he exercises it.
Given Diaw's production in 2012/13 (5.8 PPG, 3.4 RPG, 11.9 PER), he'd be very unlikely to land a deal with a higher annual salary than the $4.7MM he'll receive from San Antonio, so it'd be pretty surprising if he decided to opt out. Assuming he makes the decision official, he'll become the second Spur to pick up his player option this week, as Patty Mills exercised his on Monday.