"From where it was a few months ago, where I felt so good and my ball-striking was some of the best I've ever had, it is a little surprising, " the 42-year-old lefthander said.
Mets lefthander Pedro Feliciano, who continues to wear a monitor on his chest to keep track of an irregular heartbeat, retired the two lefty batters he faced after replacing Harvey in the fifth.
Only a century in a Sheffield Shield match last week secured the 35-year-old's test spot after a run of poor form in the longer form of the game and the lefthander responded with only his third 50-plus Test score since his 134 against Pakistan in January.