Former US Open winner Dominic Thiem will retire from tennis at the end of the season. The 30-year-old Austrian made the announcement on Instagram on Friday. “I have to tell you a very important, very sad but also a very beautiful message: The season 2024 is going to be my last one,” Thiem said in a video. One reason for his retirement is his constantly injured wrist, another is his emotional state, he said. The former top 10 player and twice French Open runner-up will go down in history as one of Austria’s most successful sportsmen. In 2020, he celebrated his greatest victory in the final in N…