This experience led to Ball being signed on an initial three-year deal by Welsh regional team the Scarlets in 2012.

[3] Ball made his professional debut for the club on 15 September 2012, coming on as a 61st-minute replacement in the team's victory over Connacht in the Pro 12 tournament.

[4] During Ball's spell playing in Wales for the Scarlets, he had been a part of the 2016–17 Pro12 league winning season for the Welsh side.

[9] He made his debut off the bench in the 26–3 loss to Ireland in week 2 of the tournament,[10] before making his first test start in a 27–6 victory over France in Wales' third match.

After his return, Ball played a part in Wales' Grand Slam-winning 2019 Six Nations Championship campaign, and later that year he featured prominently in the 2019 Rugby World Cup.