The left-hander hit 38 boundaries and 11 sixes in his 437 ball knock in 622 minutes stay at the crease.
Hayden eclipsed Brian Lara's nine-year old record of 375 against England in Antigua. Hayden became only the second player in history to score a triple century in Australia. Only Robert Cowper has scored a triple hundred in Australia in 1965 against England at the Melbourne Cricket Ground.
Hayden resumed his innings on his overnight score of 183 and smashed five sixes in the morning session to surpass his previous best of 203.
He reached his triple hundred against Zimbabwe in the first Test off only 364 balls with 33 boundaries and eight sixes. He also surpassed the previous highest score, Michael Slater's 219 against Sri Lanka in 1995-96, at the WACA.
300-run club in Tests:
| Batsman | Runs | For | vs | Inn | Test | Series |
| M Hayden | 380 | Aus | Zim | 1st | 1st | 2003-04 |
| BC Lara | 375 | WI | Eng | 1st | 5th | 1993-94 |
| GstA Sobers | 365* | WI | Pak | 1st | 3rd | 1957-58 |
| L Hutton | 364 | Eng | Aus | 1st | 5th | 1938 |
| ST Jayasuriya | 340 | SL | Ind | 1st | 1st | 1997-98 |
| Hanif Mohammad | 337 | Pak | WI | 2nd | 1st | 1957-58 |
| WR Hammond | 336* | Eng | NZ | 1st | 2nd | 1932-33 |
| MA Taylor | 334* | Aus | Pak | 1st | 2nd | 1998-99 |
| DG Bradman | 334 | Aus | Eng | 1st | 3rd | 1930 |
| GA Gooch | 333 | Eng | Ind | 1st | 1st | 1990 |
| Inzamam ul Haq | 329 | Pak | NZ | 1st | 1st | 2001-02 |
| A Sandham | 325 | Eng | WI | 1st | 4th | 1929-30 |
| RB Simpson | 311 | Aus | Eng | 1st | 4th | 1964 |
| JH Edrich | 310* | Eng | NZ | 1st | 3rd | 1965 |
| RM Cowper | 307 | Aus | Eng | 1st | 5th | 1965-66 |
| DG Bradman | 304 | Aus | Eng | 1st | 4th | 1934 |
| LG Rowe | 302 | WI | Eng | 1st | 3rd | 1973-74 |