The Detroit Pistons agreed to a three-year, $21 million deal with center Boban Marjanovic. The San Antonio Spurs now have three days to decide whether to match the offer or let Boban head to Detroit. The 7-foot-3, 27-year-old Serbian averaged 5.5 points, 3.6 rebounds and 0.4 blocked shots in 54 games as a rookie last season for the Spurs.