Saints scored three late tries as Rhinos imploded, having Zane Tetevano sent-off and Bodene Thompson and James Bentley sin-binned, all in separate incidents.
The trio had each played well and would have received higher marks, but for those lapses.
Harry Newman had a fine game in his second start of the season, but Leeds finished well beaten and a top-six place is now looking unlikely.
Here's how the Rhinos players rated, along with marks for the Saints side and referee.
Harry Newman had a fine game in his second start of the season, but Leeds finished well beaten and a top-six place is now looking unlikely.
7. Aidan Sezer (No 7)
Steady return for long-term injury, if nothing fancy 6 Photo: Allan McKenzie/SWpix.com
8. Mikolaj Oledzki (No 8)
Big first stint, but the pack were out muscled 6 Photo: Allan McKenzie/SWpix.com
9. Kruise Leeming (No 9)
A decent effort, but never quite broke clear 7 Photo: Bruce Rollinson
10. James Bentley (No 11)
Had a reasonable game but the sin-binning was ridiculous 5 Photo: Steve Riding
11. Bodene Thompson (No 19)
Made some good tackles and scored, but the yellow card prompted Leeds’ collapse 6 Photo: Tony Johnson
