[2] The following year, Rupinder scored his first international Hat-trick against Great Britain[3] in the 2011 Sultan Azlan Shah Cup.

In the same tournament, Singh won the Top-scorer Award and was named in the Sultan Azlan Shah XI Team.

He came out of retirement in May 2022 and was supposed to lead Indian team in Asia cup starting on May 23 in Jakarta, Indonesia but will not as he is ruled out of the tournament due to a wrist injury.

[4] During an interview, Rupinder was quoted saying "I was surprised when the Delhi side picked me up for such a huge amount, but the tournament gave me a good platform to hone my skills, spending time with players like Sardar Singh and Nicolas Jacobi made me improve my game a lot and it showed in my performance, Even though we lost to Ranchi in the final, the team had a good run in the tournament".

Rupinder was declared the Player of the Tournament at the 2016 Hockey India League, and due to his significant contributions, Delhi Waveriders went on to secure the 3rd position at the HIL that year.