Tony Trabert wins men's singles championship at Wimbledon in 1955

The video discusses a tennis match where the American player performed exceptionally well. Set two was competitive, ending at 75, but the American dominated the next set, leading 51 and securing match point. Ultimately, the American won in straight sets, not losing a single set throughout the meeting.

What was the significance of the match point mentioned?

What does it mean that he didn't lose a single set?