The 24 - year - old felt most under pressure at the start of the second set when he allowed Berdych two break points .
He did n't take long to overcome his jitters and deliver another breath - taking display of brutal hitting .
The 24 - year - old felt most under pressure at the start of the second set when he allowed Berdych two break points , but he did n't take long to overcome his jitters and deliver another breath - taking display of brutal hitting .