He held the record for most runs in an over in a One Day International for England, with 30, scored off Yuvraj Singh of India on 5 September 2007.

He was the bowling coach for both Otago and the New Zealand national cricket team[1] before resigning after the 2016 summer for family reasons.

In 2004, he was the first player to record a hat-trick in Twenty20 cricket, claiming the wickets of Mark Davis, Mushtaq Ahmed and Jason Lewry of Sussex.

In 2006, it was announced that Mascarenhas would receive a benefit year during the 2007 season as a reward for his excellent all round play for the county.

During the 2009 County Championship Mascarenhas missed the first matches of the season while playing in the IPL with the Rajasthan Royals.

Prior to the 2010 County Championship, Mascarenhas played for the Rajasthan Royals in the IPL, during which he picked up an ankle injury.

[6] Mascarenhas was bought by the Kings XI Punjab franchisee during the auction conducted in January 2011 but had to be replaced by David Miller after struggling to recover from an Achilles tendon injury.

In September 2006, Hampshire's Australian county captain Shane Warne publicly highlighted Mascarenhas' tremendous ability and issued a call for him to be rewarded with selection for the England One Day International (ODI) team.

[9] On 5 September 2007, in an ODI against India, he hit consecutive sixes off the final five balls of England's innings, which were bowled by Yuvraj Singh.

[13] He has completed an ECB level-three coaching qualification and held player-coach roles with Hampshire, Rajasthan Royals and Hobart Hurricanes.