If that's the first one at his Mega Compound where it's 2 of 3...
Just have to be smooth with a little bit of luck. My best line was just to do whatever I could on the first big jump and then another huge trick over the elbow on the big tranny on the other side. I did the loop-de-loop to cross over the water and didn't bother with tricking much. Bust a big move over the other tranny and cross the finish line first.
If you outscore him and travel fast, you beat him. You can't spend a bunch of time tricking around or he'll outscore you. It's almost like a "trick race". Score big, but keep moving quickly and hit the finish line before him. He doesn't keep to get racking up the score once you finish...it just ends when you cross.