Doug is correct, here's the breakdown:
First race:
1. Marc (100)
2. Masami (99)
3. Daisuke (98)
4. Hara (97)
Second race:
1. Daisuke (100)
2. Hara (99)
3. Marc (98)
4. Masami (97)
So right now:
1. Daisuke (198)
2. Marc (198)
3. Hara (196)
4. Masami (196)
If Daisuke or Marc wins the third main, they win. If Hara or Masami wins, they need Marc and Daisuke to finish 4th or worse for an outright win. If either finishes third in that scenario, it would go to a tiebreak. If Hara or Masami wins and Daisuke or Marc finishes 2nd, then whoever finishes 2nd will win.