That someone was actually Wario, who was cheering on his brother Waluigi in the race.
1. Sonic (5th lap)
2. Shadow (4th lap)
3. Waluigi (on his 4th lap; he is ahead of both Tails and Amy, who are both taking shots at his legs)
4. Tails (4th lap, kicking Waluigi in the legs)
5. Amy (4th lap, kicking Waluigi in the legs)
6. Vivian (3rd)
7. Yoshi+Mario ( 2nd lap, both have teamed up, Mario is riding on Yoshi's back)