Joe Marler faced a number of elite opponents during his decade as a front-row lynchpin at Twickenham.
The England and Harlequins loosehead has revealed three of the opposition players he found it most difficult to play against in the scrum and across the field.
Check out who he picked below.
#3.Tadhg Furlong (Ireland)
Head and shoulders above his nearest competition as the best tighthead prop in rugby at the moment, the Irishman was un-droppable for both Ireland and Warren Gatland's Lions across 2021.
Marler said: "He can do everything. He's not just a scrummager, not just a ball-carrier, he's got the all-round game."
#2. Dan Cole (England)
Marler said: "I love sappy, negative drinking sessions, and you're always guaranteed that with old Colar Bear. He has a sensible head and is a great mind reader too. When I went AWOL in Japan at the end of the World Cup, he tracked me down..."
Leicester Tigers player Dan Cole during the Gallagher Premiership Rugby Match between Leicester Tigers and London Irish on the first midweek round of matches as part of the Return to Rugby campaign as rugby continues after COVID 19 lockdown at Welford Road on 26 Aug. Photo: Steve Bond/PPAUK/Gallagher
#1. Carl Hayman (New Zealand)
Having appeared over 40 times for New Zealand, Hayman is regarded as the finest tighthead prop to have ever played the game. Technically, Hayman is the hardest man to try and destabilise in the scrum. This showed in Toulon’s Heineken cup-winning campaigns in 2013 & 2014 where Hayman was dominant in virtually every engagement.