Thunder guard Shai Gilgeous-Alexander, right, drives to the basket as Los Angeles Lakers guard Austin Reaves, left, defends second half of Game 1 in a second-round NBA basketball playoffs series May 5, 2026 in Oklahoma City. AP The defending champion Thunder jumped out to a 1-0 series lead over LeBron James and the Lakers with a 108-90 victory Tuesday . Game 2 is set for 9:30 p.m. ET on Thursday, and bettors can use the Fanatics promo code NYPOST to bet $20 and get $200 FanCash bonus . This is expected to be a blowout, with the Thunder set as 15.5-point favorites at Fanatics Sportsbook . Fanatics Sportsbook promo code NYPOST for Lakers vs. Thunder Those who haven’t signed up y et can use the Fanatics Sportsbook promo code NYPOST at checkout for $200 in FanCash. Place $20 on any Lakers vs. Thunder bet on Thursday and the bonus value — good for seven days — will appear in your account upon settling.…