WIMBLEDON, England — The sight of Serena Williams sending a ball zooming past a helpless opponent, as she frequently did during the first week of Wimbledon, has become familiar at the All England Club in the last 15 years.

But for Williams, who is on a career-best 34-match winning streak, the equipment that sends the ball across the net has changed significantly.

In late March 2012, Williams switched from playing entirely with natural gut strings, made from dried elastic fibers extracted from cow intestines, to using a mix of natural gut and synthetic strings. Her rackets now contain a hybrid of old and new technology, with natural gut in the mains, or vertical strings, and Wilson Luxilon 4G in the crosses, or horizontal strings.

Since making the switch, Williams has been on perhaps the best run of her career, compiling a 94-4 singles record. In that 15-month stretch, she has won 13 titles, including three Grand Slam titles (Wimbledon and the United States Open last year and the French Open this year), her first Olympic gold medal in singles and her first three titles on red clay since 2002.