In a
Twenty20 cup match against
Sussex on 24 June 2008, Napier scored 152 not out from 58 balls. The innings set a number of records, notably the highest individual score in a T20 innings in England, and in the domestic Twenty20 competition; the highest number of sixes in an individual Twenty20 innings (16); the most runs scored in boundaries in an individual Twenty20 innings (136 runs, scored as 10 fours, and 16 sixes). It also broke the record for most sixes in a domestic one-day innings, and tied the record for most sixes in any domestic innings, tying the record set by
Andrew Symonds, during a
County Championship game in 1995. Graham Napier has the record for the highest ever T20 score when batting at number 3 position.(152*). Also he's in second in the list for scoring the most number of boundaries in a T20 innings.(26 boundaries-10 fours and 16 sixes) and also second in the list for hitting the most number of sixes in a T20 innings. He was signed by the Mumbai Indians for the 2009 IPL Season for an undisclosed amount. In March 2009, Napier was called up to the
England Lions squad for the first time since 2004.
Geoff Miller, one of the selectors, said "the selectors felt this was a good opportunity for us to have a closer look at him within the England set-up". On 1 May 2009, Napier was confirmed as a member of the 15-man England squad for the 2009 Twenty20 World Cup on the same day as he made his first appearance for the
Mumbai Indians. On 3 June 2013, Napier finished a
YB40 match with figures of 7 wickets for 32 runs, including 3 maidens, taking 4 wickets in 4 balls as Essex beat Surrey by 178 runs. ==First-class==