Update: Martin is dealing with an illness and will not play in Sunday's Game 4 against the Grizzlies, Jabari Young of San Antonio Express-News reports.
Analysis: Martin went into Friday's Game 3 available to play, but was eventually held out because of an illness. He's still feeling some lingering effects and will sit out of Sunday's Game 4 as well. The illness likely won't keep Martin out for long and if the Spurs finish off the sweep Sunday, the earliest they could start the second round is next Saturday, which means Martin should have nearly a week off for recovery.
A person with knowledge of the situation tells The Associated Press that free agent guard Kevin Martin has agreed to join the San Antonio Spurs.
Martin reached a buyout with the Minnesota Timberwolves on Tuesday and was eager to join a playoff contender. He made the decision to choose the Spurs and bring his perimeter shooting and scoring ability to one of the best teams in the league.