He made a memorable One Day International debut a few days later, top scoring for the match with 81 runs from 97 balls and winning the Man of the Match award. With the recent retirements of two of Australia's longest-serving ODI opening batsmen in Adam Gilchrist and Matthew Hayden, Marsh was able to claim one of the opening batsmen positions for the 2008–09 season.
He made a notable One Day International debut a short while after, scoring the most runs in the match with 81 runs from 97 balls and winning the Man of the Match award. With the recent retirements of two of Australia's longest-serving ODI opening batsmen in Adam Gilchrist and Matthew Hayden, Marsh was able to secure one of the opening batsmen positions for the 2008–09 season.