Potential tough starts for (1) Nadal vs. his free-swinging Spanish countryman F-Lo (winner to possibly meet (WC) Thanasi Kokkinakis), (4) Sock 2nd rd. vs. the Aussie Open semifinalist Chung, (6) Del Potro vs. the elder net-rushing Zverev, (3) Thiem 2nd rd. vs. the Nishikori-Shapovalov winner, and (8) Isner vs. his countryman Harrison...
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