Alexander Zverev held off a battling display from Miomir Kecmanovic to keep his hopes of winning a record fourth Munich Open title going.
Frances Tiafoe came out on top in another thrilling match at the Mexican Open, beating Brandon Nakashima to reach the final in Acapulco.
Flavio Cobolli is the highest ranked player remaining in the Mexican Open after he defeated Wu Yibing in straight sets.
Mexican Open top seed Alexander Zverev was shocked by Miomir Kecmanovic, who said he felt no pressure against the world number four.
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