The Argentine, who won the previous ATP tournament in Indian Wells, on Wednesday prevailed over the Canadian 5-7, 7-6, 7-6, winning two crucial tie-breaks to qualify for the semi-finals where he will face John Isner of the US, reports Efe.
"It was great tennis, a great battle, and I think we both enjoyed the game. I'm so glad I'm still alive (in the tournament)", Del Potro said.
With the win, the world number 6 has extended his unbeaten run to 15 matches.
"I'm thinking about my last effort of the trip, that it could be my last match, but I always have another chance after tomorrow. I'm glad with my level of tennis, and of course I want to be in the final," Del Potro added.
Del Potro will play Isner on Friday for a place in the final.
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