So far in his career, Andy Murray has won 52% of his second serve points which places him just inside the top 40 on the ATP World Tour since they started keeping stats in 1991. Murray has been pretty consistent, but not outstanding, with his second serve points won over the last few years. He’s raised his winning percentage this year and his results have followed. He’s reached the finals of all three Grand Slam events this year, winning his second Wimbledon title in July.
In his first round at the U.S. Open, Murray won 19 of 29 (66%) of his second serve points and did not face a break point against his serve.