Hall of Fame
Agreed, that IS the biggest advantage; that almost every single big point is played on a lefty's best, most natural serve-out-wide (unless 15-40, it's all true for 0-40, 30-40, 40-30, Ad-40, 40-Ad). Righties don't have this luxury, the opposite really, thus a huge disadvantage, and likely why Fedr is soooo bad at converting BPs. He gets to the BPs often bc those points that lead to BPs for him are from lefty-serves that can't naturally exploit his BH wing as much.Yes, Shapovalov went 0-7 in 2018 vs fellow lefties, all except the Nadal loss in Rome being to underdogs. He has bounced back with a 2-0 record in 2019 vs Klizan in DC and Humbert in Lyon, both on clay BTW (Klizan indoors clay).
That ‘18 skid was particularly disappointing after those two wins vs The Nadal and Mannarino in Montreal’17. No sneaking up on his victims after that run and his six wins to qualify and reach USO 4R.
I think the biggest advantage (pun very much intended) for lefty vs righty is really big points (40-30, 30-40 and the ad in/out points) within games help the sinister siders if they have a spinny slice serve to take the receiver further off the court. For Shapo to attack fellow southpaws more effectively on those points he needs a better kicker down the T to those lefty BHs.