Zverev overcomes grass allergy and Blockx to advance to Wimbledon’s second round

French Open winner beats Belgian 6-4, 6-7, 7-6, 7-6 Zverev’s big serves breaks down tough opponent Alexander Zverev’s serve is at once among the most potent and also the most perplexing weapons in tennis. When it is working as it should, which is about 98% of the time, the…

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