That has become very clear in this America's Cup, which stands at 2-2 going into the weekend racing.
As a Kiwi I want Team New Zealand to win every race, but as a sailor it is great to see how the close racing has drawn in the general public because it is very exciting to watch.
After Luna Rossa won race three to take a 2–1 lead, I was starting to get apprehensive.
TNZ had positioned Te Rehutai further away from Luna Rossa in the first race, which meant the Italians were not affected by dirty air and had an advantage.
However, in Friday's second race, Peter Burling made sure that TNZ was tight to leeward forcing Luna Rossa to tack away.
I think that TNZ had control from the start even though it may have appeared to take a while for their advantage to emerge after a tacking duel.
This regatta continues to throw up surprises.
Heading into the America's Cup, everyone thought that Luna Rossa had an advantage in light airs, but TNZ proved the theory wrong in race four.
You can see that Team New Zealand are more aggressive in their starts, compared to when we saw them racing in the Christmas Cup.
TNZ, who have been starved of racing, are clearly learning more and more with every race.
Remember that they made a strong start in the pre-start in race three although it came to nought because the race had to be abandoned, due to spectator crafts on the course.
I expect to see close racing on the weekend, and more aggressive pre-starts.
The two teams are pretty even. Luna Rossa appear slightly faster upwind, and Team New Zealand certainly has the edge downwind.