St. Louis ? The Arizona Diamondbacks may have lost a lot more than a chance to clinch a playoff berth.

Luis Gonzalez, who leads the team in home runs and RBIs, separated his left shoulder in an outfield collision as the Diamondbacks lost 13-1 to the St. Louis Cardinals on Monday night.

The star left fielder was going back to Phoenix today to meet with team physician Dr. Michael Lee.

Best case scenario, itll be a first-degree separation and itll be maybe a week, Arizona trainer Paul Lessard said. Worst case scenario would be the season.

Gonzalez is batting .288 with 28 home runs and 103 RBIs. He got the hit that won last years World Series for the Diamondbacks.

The Cardinals broke open the game by scoring 10 runs in the seventh inning, and sent Arizona to its fourth straight loss. The NL West leaders have a magic number of one for wrapping up a playoff berth, with six games to go.

Eli Marrero had four hits for the second time in four games. St. Louis tied a season high with 18 hits.

Jamey Wright (7-13) allowed a run on three hits in five innings.

Albert Pujols RBI double off the right-field wall against Rick Helling (9-12) snapped a tie in the Cardinals two-run fifth.

Astros 8, Brewers 6

Houston Jeff Bagwell hit a two-run single, helping Houston beat Milwaukee.

Richie Sexson doubled home a run for Milwaukee, giving him 100 RBIs for the third time in his career.

Brandon Puffer (3-3) was the winner, pitching one scoreless inning.

Glendon Rusch (10-15), a former Royal, gave up seven runs, only four of them earned, in five innings.