Sinner and Alcaraz wobble but advance to Monte Carlo quarter-finals

Jannik Sinner beat the wildly erratic Tomas Machac 6-1, 6-7 (3/7), 6-3, while Carlos Alcaraz suffered his own second-set stumble before he beat Tomas Etcheverry 6-1, 4-6, 6-3.

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