NEW YORK (AFP) - Two of the National Basketball Association's Eastern Conference divisional doormats, New York and Detroit, took shock triumphs on Tuesday over top Western Conference clubs, stunning the reigning champions San Antonio and Memphis Grizzlies respectively.

The league-worst New York Knicks upset the visiting San Antonio Spurs 104-100 in overtime, while the Detroit Pistons recovered from a 15-point half-time deficit to defeat visiting Memphis 105-95 and snap a 10-game losing streak.

New York's Langston Galloway scored 22 points while Russian backcourt partner Alexey Shved added 21. Lou Amundson had 12 points and a career-high 17 rebounds and Italy's Andrea Bargnani contributed 16 points and 10 rebounds as the Knicks improved to 14-53, still the NBA's worst mark.

Tony Parker led the Spurs with 21 points while Tim Duncan added 17, Kawhi Leonard scored 13 points and Tiago Splitter had 12 points and 13 rebounds in a losing cause.

The Spurs slid to 41-25, seventh in the Western Conference.

At Detroit, Kentavious Caldwell-Pope scored 24 points and Reggie Jackson added 23 points and career-high 20 assists in the Pistons' comeback, which saw them outscore Memphis 66-41 in the second half.

Jackson scored seven points in a 15-2 run late in the fourth quarter to seal the Grizzlies' fate.

Jeff Green led Memphis with 21 points while Marc Gasol had 17 points and 11 rebounds for the Grizzlies, who had not lost at Detroit since 2009.

The Pistons are 24-43, last in the NBA Central division, while Memphis remained atop the Southwest division despite falling to 47-21, still the third-best record in the NBA.