Kei's Gatorade TV commercial, which has been on air on Japanese TV since May.
The rap music is by Tha Blue Herb.
Making of the Gatorade commercial
Apparently, Kei made very few NGs and said he really enjoyed the two days of filming.
...But he also said he had slight pain in his arm before hitting the ball. In hindsight, I think he should have said "no" to playing and asked the director to use videos from his past matches or practice.