Without center Andrew Bynum, the Los Angeles Lakers have reason for concern. The San Antonio Spurs, meanwhile, should be concerned that they haven’t beaten a winning team in more than a month.

Both clubs - who have combined to win seven of the last nine NBA titles - try to overcome their concerns Tuesday when they meet in San Antonio.

The Lakers (27-12) assuaged some of their fears by beating Denver 116-99 on Monday, their first convincing win without Bynum in the lineup. The 20-year-old center, who leads the NBA with a 63.6 field-goal percentage and is averaging a team-high 10.2 rebounds, injured his knee on Jan. 13 against Memphis, a game the Lakers won 100-99. He is expected to miss about two months.

In the first two games following Bynum’s injury, the Lakers