![Grigor Dimitrov, of Bulgaria, reacts during a match against Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP Grigor Dimitrov, of Bulgaria, reacts during a match against Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP](https://l450v.alamy.com/450v/2rn4txy/grigor-dimitrov-of-bulgaria-reacts-during-a-match-against-andy-murray-of-great-britain-during-the-second-round-of-the-us-open-tennis-championships-thursday-aug-31-2023-in-new-york-ap-photomary-altaffer-2rn4txy.jpg)
Grigor Dimitrov, of Bulgaria, reacts during a match against Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP
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Tennis chiefs announce major rule change effective next year that could benefit Andy Murray | talkSPORT
![Grigor Dimitrov, of Bulgaria, reacts after defeating Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP Photo/Mary Altaffer Grigor Dimitrov, of Bulgaria, reacts after defeating Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP Photo/Mary Altaffer](https://l450v.alamy.com/450v/2rn68fp/grigor-dimitrov-of-bulgaria-reacts-after-defeating-andy-murray-of-great-britain-during-the-second-round-of-the-us-open-tennis-championships-thursday-aug-31-2023-in-new-york-ap-photomary-altaffer-2rn68fp.jpg)
Grigor Dimitrov, of Bulgaria, reacts after defeating Andy Murray, of Great Britain, during the second round of the U.S. Open tennis championships, Thursday, Aug. 31, 2023, in New York. (AP Photo/Mary Altaffer
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