On 8 June 2013, Roux signed a two-year deal with reigning A-League Champions Central Coast Mariners.
His competitive debut came in the Mariners' first game of the 2013–14 season, a 1–1 draw with Western Sydney Wanderers, with Roux earning praise from coach Graham Arnold for his performance.
He scored his first goal for the club and the only goal of the game in a win over Wellington Phoenix in December 2013 with a calm finish from close-range.
Strong performances saw Roux named the December nominee for the A-League Young Footballer of the Year award for 2013–14.
The award was eventually given to Adam Taggart.
Roux had a solid first season for the Mariners, becoming a regular member of the starting side under new coach Phil Moss.
In July 2014, Roux signed a new contract with the Mariners until 2017.

Roux was selected by fan vote to play for the A-League All Stars in 2014 against Juventus.
He came on as a second-half substitute for Manny Muscat in a 3–2 loss.

On 30 January 2016, Roux scored his second goal for the Mariners, again in a win over Wellington, playing a one-two with Luis García before chipping the 'keeper.
On 21 February 2016, Roux fell awkwardly whilst attempting to block a shot in a game against Melbourne City, resulting in a broken fibula, damaged ligaments and a dislocated shoulder, ruling him out for the remainder of the season.
He returned to training in June 2016 ahead of the 2016–17 season.

Roux captained the Mariners for the first time in a draw with Western Sydney Wanderers on 29 October 2016 in the absence of regular captain Nick Montgomery, and was named man of the match for his performance.
In April 2017, he extended his contract with the club until mid-2019.
Roux made his 100th A-League appearance in a draw with Adelaide United on 7 February 2018, and made his 100th league appearance for the Mariners one week later.

In April 2018, Mariners coach Wayne O'Sullivan refused to comment on speculation that Roux could move to Melbourne Victory.
Roux was granted a release from the club on 18 April 2018 to pursue other opportunities.

Roux would later say he had felt "stale" at the Mariners following multiple unsuccessful seasons for the club and Roux's injury issues.
On 8 June 2013, Roux signed a two-year deal with reigning A-League Champions Central Coast Mariners. His competitive debut came in the Mariners' first game of the 2013–14 season, a 1–1 draw with Western Sydney Wanderers, with Roux earning praise from coach Graham Arnold for his performance. He scored his first goal for the club and the only goal of the game in a win over Wellington Phoenix in December 2013 with a calm finish from close-range. Strong performances saw Roux named the December nominee for the A-League Young Footballer of the Year award for 2013–14. The award was eventually given to Adam Taggart. Roux had a solid first season for the Mariners, becoming a regular member of the starting side under new coach Phil Moss. In July 2014, Roux signed a new contract with the Mariners until 2017.
Roux was selected by fan vote to play for the A-League All Stars in 2014 against Juventus. He came on as a second-half substitute for Manny Muscat in a 3–2 loss.
On 30 January 2016, Roux scored his second goal for the Mariners, again in a win over Wellington, playing a one-two with Luis García before chipping the 'keeper. On 21 February 2016, Roux fell awkwardly whilst attempting to block a shot in a game against Melbourne City, resulting in a broken fibula, damaged ligaments and a dislocated shoulder, ruling him out for the remainder of the season. He returned to training in June 2016 ahead of the 2016–17 season.
Roux captained the Mariners for the first time in a draw with Western Sydney Wanderers on 29 October 2016 in the absence of regular captain Nick Montgomery, and was named man of the match for his performance. In April 2017, he extended his contract with the club until mid-2019. Roux made his 100th A-League appearance in a draw with Adelaide United on 7 February 2018, and made his 100th league appearance for the Mariners one week later.
In April 2018, Mariners coach Wayne O'Sullivan refused to comment on speculation that Roux could move to Melbourne Victory. Roux was granted a release from the club on 18 April 2018 to pursue other opportunities.
Roux would later say he had felt "stale" at the Mariners following multiple unsuccessful seasons for the club and Roux's injury issues.
Storm Roux