Taylor Fritz’s girlfriend once again boasted on social media of the tennis star’s victory over Alexander Zverev, this time at the US Open. Social media influencer Morgan Riddle sparked a feud during Wimbledon when Fritz defeated Zverev in a five-set bonanza. In a video post that was later deleted, she uploaded a short clip with the caption: “When your man wins 4 the girls.” Many considered it a dig at Zverev, who agreed to pay his former partner around £180,000 after domestic abuse allegations. The German has always maintained his innocence over the charges and was never convicted, denying any…