MONTE CARLO - Canadians Denis Shapovalov and Gabriel Diallo dropped their opening men's singles matches Monday at the Monte Carlo Masters tennis tournament.

Belgian Alexander Blockx defeated Shapovalov, of Richmond Hill, Ont., 6-4, 4-6, 6-3. Both players had two aces, but the Canadian recorded more than twice as many double faults (five) as Blockx (two).

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