Tennis star Naomi Osaka was not going to let her best friend Alex Boston escape the spotlight on her special day. After winning her quarterfinal clash at the Canadian Open, Osaka revealed to the crowd that it was her friend's birthday, and that she was trying to hide.After taking the mic, Osaka was asked who her best friend was. She pointed to Boston and said:"This beautiful girl right here (laughing). She's like my best friend and agent."Osaka then moved away from the reporter as she spotted Boston getting away from the court. She used the moment to call Boston her "best friend," before singing "happy birthday."On Tuesday, August 5, Osaka shared the clip of the entire moment on Instagram. She added a heartfelt caption along with it that read:"Happy bday to the one and only AB." View this post on Instagram Instagram PostAlex Boston is the talent manager at Evolve Agency, Osaka’s athlete-led sports and lifestyle firm. She works closely with Osaka and the Duguid family to nurture strategic partnerships, and manages athlete signings and brand collaborations.Naomi Osaka enters the semifinals of the Canadian OpenNaomi Osaka hasn't had a great year by her standards, but things are falling in place at the ongoing Canadian Open. After a first-round exit at Roland Garros and a third-round defeat at Wimbledon, Osaka seems to be getting back on track for the final Grand Slam of the year, the US Open.On Tuesday, Osaka advanced to the semifinals of the Canadian Open after defeating 10th-seed Elina Svitolina 6-2, 6-2. This will mark Osaka’s first appearance in a WTA 1000-level semifinal since Miami in 2022."I'm really happy," Osaka said after winning the quarterfinals. "I'm also really excited. I don't know. It's kind of interesting, because I told people this before, but like, obviously after Wimbledon, I was really disappointed. Then I just kind of let go of my expectations, and now we're here. So I find it kind of ironic, but I'm happy about it."Naomi Osaka will face 16th-seed Clara Tauson in the semifinals. The Dane defeated Madison Keys 6-1, 6-4, in the quarterfinals. This was Tauson's second consecutive win over a top-10 opponent after eliminating Wimbledon champion Iga Swiatek earlier in the tournament.When Osaka was asked to remember her first match against Tauson, she replied:"Honestly, I remember feeling like she was a little unconventional. I don't remember why exactly I felt that way, but I think she had a really interesting game. I did watch her play Keys a little bit, but I was, like, warming up and stuff. I'll be curious to see what happens."It remains to be seen if Naomi Osaka can win the Canadian Open and head to Cincinnati with added confidence. She will be eyeing her fifth major title at the US Open.