on 28 july 2013, at the fina world championships in barcelona, stravius was part of the winning 4 × 100 m medley relay where he swam the butterfly leg. stravius was in the anchor position for france in the 4 × 100 m men's freestyle final. the french were the defending olympic champions but were seeded outside the middle lanes in the final, causing stravius to remark "on n'était pas favoris, c'est un hold up". in the final, after 200 m where france was far off from the leading three teams, fabien gilot exploded through with a 46.90s third leg to bring the french back into contention. then, stravius took over the australians at the start of his leg and trailing the russians and american swimmers at the midpoint of his anchor leg, stravius snapped a precise flipturn and, after several powerful dolphin kicks underwater, emerged ahead by a hand, eventually securing the gold medal for france by 0.26s. he also won silver medals in the 50 m backstroke and the 100 m backstroke. at this meet he also swam the 200 m individual medley and the 4 × 200 m freestyle relay.