SAN ANTONIO (Ticker) -- The Seattle SuperSonics will not have a chance to beat the San Antonio Spurs in their Western Conference semifinal series if the injuries continue to mount.

In the series opener, San Antonio rolled to a 103-81 victory over the SuperSonics, who lost more than a game on Sunday. Ray Allen and Vladimir Radmanovic suffered sprained ankles in the first half and Rashard Lewis hurt his groin in the third quarter.

Allen, who averaged 32 points in Seattle's opening-round series against the Sacramento Kings, is a game-time decision and did not practice on Monday.

Radmanovic is likely out for the remainder of the series with a severely sprained right ankle. He missed the last 19 games of the regular season with a stress fracture in his right fibula.

After Allen and Radmanovic left the game Sunday, San Antonio went on a 17-2 run to open a 30-point lead late in the second quarter and held Seattle to 13 points in the period.

Tony Parker tied a playoff career-high with 29 points, while Tim Duncan scored 22 and Glenn Robinson added 16 for the Spurs, who shot 51 percent (35-of-69) from the floor and won their fifth straight playoff game.

Duncan and Parker each scored 11 first-quarter points and the Spurs made 12-of-18 shots in the period to win for the 41st time in 45 home games this season.

Lewis, who returned in the fourth quarter, led Seattle with 19 points and Antonio Daniels added 15 for the SuperSonics, who were outrebounded, 46-31.

The series will shift to Seattle for Game Three on Thursday.