Ravaged by injuries and struggling like never before for form, the inspirational Australian captain Michael Clarke on Saturday announced he would retire from Test cricket after the fifth and final match of the on-going series. The fifth Test will begin from August 20 at the Oval and would be Clarke's 115th five-day game. The 34-year-old Clarke has already quit ODI and Twenty20 cricket. Clarke retired from ODIs after leading Australia to a fifth World Cup title this year. Never too keen on the Twenty20s, he quit the format back in 2010 after playing just 34 matches. Clarke's 114 Test appearances so far have yielded 8628 runs at an impressive average of 49.30. He scored 7981 runs in 245 ODIs at an average of 44.58.