The 31-year-old Ericsson from Kumla, Sweden, led three times for 13 of 200 laps before fending off Pato O'Ward in a two-lap shootout to claim his first Indy 500 title.
The third-generation Andretti driver from Nazareth, Pennsylvania, is primed to reach a milestone start in his 17th consecutive appearance in the Indianapolis 500.
The 22-year-old Herta from Valencia, Santa Clarita, California, led three times for a race-high 50 of 75 laps to claim his first IndyCar victory of the season at Indy's road course amid slick conditions,
The two-time IndyCar champion from Hendersonville, Tennessee, benefitted through an executed pit strategy before prevailing over late challenges from Romain Grosjean and Alex Palou to notch his first elusive victory at the Streets of Long Beach.
The 2016 Indianapolis 500 champion from Auburn, California, will be achieving a milestone start in his seventh full-time season in IndyCar competition.
The finish to Sunday's NTT IndyCar XPEL 375 proved to be spectacular finish to a spectacular race, which has proven to be something of a rarity in recent memory at Texas Motor Speedway.
