MADRID, April 29 -- Hailey Baptiste ended Aryna Sabalenka's title defence in Madrid on Tuesday and halted the world number one's 15-match winning streak with a 2-6, 6-2, 7-6 (8/6) quarter-final victory to deliver the biggest shock of the tournament so far.

The American saved five match points at 4-5 in the decider and a sixth in the tiebreak before she handed Sabalenka just her second defeat of the year, and her first since the Australian Open final three months ago.

Sabalenka is a three-time champion in Madrid and reached the final in the Spanish capital in each of the last three editions of the event but was unable to shake off the 30th-seeded Baptiste, who peppered her with huge serves and ultra-aggressive groundstrokes to reach a ma...