Juventus's Champions League hopes are hanging on Cristiano Ronaldo pulling off another sensational comeback as the Italians trail 2-0 to defensive specialists Atletico Madrid going into the last 16, second-leg tie in Turin on Tuesday.
World number two Rafael Nadal raced into the third round of the ATP Indian Wells Masters as Roger Federer made a less speedy but still successful start to his quest for a sixth title on Sunday.
Muguruza was leading 6-3, 1-0 when Williams called it a day in the battle of former world number ones because of a viral illness.
Real Madrid's losing run is over but Santiago Solari offered no assurances over his future after a chaotic 4-1 victory over struggling Real Valladolid on Sunday.
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