Australia's Usman Khawaja celebrates his ton against England on Saturday. Pic/AFP

Usman Khawaja is relieved he finally has an Ashes Test century to savour after a "lot of carry-on" over his debut against England in Sydney seven years ago. The elegant Pakistan-born left-hander soaked up the acclaim from his home fans after scoring 171 in the final Ashes Test at the Sydney Cricket Ground on Saturday.