New Orleans Saints rookie quarterback Spencer Rattler threw his first NFL touchdown pass in Sunday’s preseason finale against the Tennessee Titans. Rattler, who relieved Jake Haener in the second quarter, connected with wideout Equanimeous St. Brown for a 21-yard score. Rattler dropped it in a bucket perfectly for St. Brown, threading the needle between two Titans defenders. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! The former South Carolina standout went 2-for-4 for 34 yards on the nine-play, 70-yard scoring drive, the best offens…