Since the retirement of the great Shane Warne in 2007, Australia have struggled to find a spinner to replace him, despite repeated attempts.
Warne's contemporaries Stuart MacGill and Brad Hogg are among those who initially tried to fill the breach but a variety of new players have also been unearthed by Cricket Australia.
Ashton Agar today became the latest on whom the Aussies are pinning their hopes.
Press Association Sport assesses how 10 of his predecessors fared.
Nathan Lyon Tests: 22 Wickets: 76 Average: 33.18 Strike-rate: 63.6
Nathan Hauritz Tests: 17 Wickets: 63 Average: 34.98 Strike-rate: 49.88
Steven Smith Tests: 7 Wickets: 4 Average: 70.75 Strike-rate: 108
Xavier Doherty Tests: 4 Wickets: 7 Average: 78.28 Strike-rate: 131.1
Cameron White Tests: 4 Wickets: 5 Average: 68.4 Strike-rate: 111.6
Michael Beer Tests: 2 Wickets: 3 Average: 59.33 Strike-rate: 135.3
Jason Krejza Test: 2 Wickets: 13 Average: 43.23 Strike-rate: 57.1
Bryce McGain Tests: 1 Wickets: 0 Average: n/a Strike-rate: n/a
Beau Casson Tests: 1 Wickets: 3 Average: 43 Strike-rate: 64
Dan Cullen Tests: 1 Wickets: 1 Average: 54 Strike-rate: 84
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