World number one Novak Djokovic began his US Open campaign with victory over Poland’s Jerzy Janowicz – despite the Serb requiring treatment to his arm.
Djokovic, who has struggled with a wrist injury, won 6-3 5-7 6-2 6-1 after calling the trainer in the first set.
Spanish fourth seed Rafael Nadal beat Uzbekistan’s Denis Istomin 6-1 6-4 6-2.
Germany’s Angelique Kerber, seeded second in the women’s draw, led Polona Hercog 6-0 1-0 when the Slovenian succumbed to leg cramps.
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