By Tzvi Machlin Scott Dixon has been one of the top drivers in the IndyCar Series for 20 years. But as he chases his second Indianapolis 500 title today, he’s already made history. During the first stage of the 2022 Indy 500, Dixon set a record for the most laps led in the history of the race. His 645 laps led have passed the late-great Al Unser Sr. for the most in Indy 500 history. Dixon still has a ways to go before winning the race. As of writing he’s been passed by Pato O’Ward and is in second place. But if he takes the lead again in this race at all, he’ll be able to start extending that …