Carlos Alcaraz came into this week's Argentina Open in Buenos Aires with question marks surrounding his form after being out since Paris with an injury.
Since then, he has relinquished the World Number One spot but has shown signs already that he could be heading back to his best already with a semi-final run.
He saw off Dusan Lajovic in straight sets on Friday night to reach the semi-finals. He will next face Bernabe Zapata Miralles.
His full array was on show from his impressive backhand to typical drop shots and sealing a 6-4, 6-2 win, he was at his best in the second set.
While not perfect, he hit 53% of his return points and converted 5/10 break points to seal victory after just over an hour and a half.