Competition concludes later today with individual event titles up for grabs.
Modi posted an 84.525 to take the senior title, followed by Canada's Anderson Loran (84.075), and Sean Melton of Orlando/U.S. Olympic Training Center, who posted an 83.225 for third.
For the junior division, Strech earned an 80.650, followed by Fabian DeLuna of Frisco, Texas/WOGA, 80.375, and Canada's Rene Cournoyer, 80.250.
Rotating in Olympic order, Modi began on the floor exercise, sticking his triple full dismount to score 14.750. On the pommel horse, he earned a 13.700. In rotation three, Modi executed a whip-it to iron cross before dismounting with a tucked, double-twisting double back on the still rings. He scored a 13.600. On the vault, his Kasamatsu full received a 14.125. Modi, who dismounts the parallel bars with a unique full-twisting, double back, earned his highest score of the night on the event, a 14.925. In the final rotation, Modi posted a 13.425 on the horizontal bar to complete his competition.
Melton earned scores of 14.300, floor; 13.775, pommel horse; 14.600, still rings; 14.375, vault; 14.525, parallel bars; and 11.650, high bar to earn the all-around bronze medal.
Also representing the USA in the senior division were: Marvin Kimble of Milwaukee, Wis./Swiss Turners, 81.650, fourth; and Adrian de los Angeles of Long Beach, Calif./University of Michigan, 80.650, fifth.
Strech earned his highest scores of the night on the vault, 14.350, and parallel bars 14.200. His other scores were 13.600, floor; 12.500, pommel horse; 13.525, still rings; and 12.475, high bar. Meanwhile DeLuna posted scores of 13.900, floor; 12.175, pommel horse; 14.075, still rings; 14.400, vault; 13.350, parallel bars; and 12.475, high bar.
USA's David Jessen of East Greenwich, R.I./Rhode Island Sports Elite, finished fourth in the all-around, posting a total score of 78.700, and Yul Moldauer of Arvada, Colo./5280 Gymnastics, finished eighth with a 68.425.