Former champion Juan Martin del Potro reaches his second successive US Open semi-final with a four-set win over John Isner.
US Open 2018: Juan Martin del Potro overcomes John Isner to reach semi-finals
BBC - 5 Sep 2018 02:33
Former champion Juan Martin del Potro reaches his second successive US Open semi-final with a four-set win over John Isner.
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