WordNet (r) 3.0 (2006):

winning streak
    n 1: a streak of wins

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "winning streak":
   Cadmean victory, KO, Pyrrhic victory, ascendancy, championship,
   conquest, easy victory, grand slam, knockout, landslide,
   landslide victory, mastery, moral victory, picnic, pushover,
   runaway victory, subdual, subduing, success, total victory,
   triumph, victory, walkaway, walkover, win, winning