Lee brings a few attributes to the table in this fight that Chavez hasn't had to deal with yet in his career. (1) As Lyle mentioned, he's a southpaw. Junior has been kept away from southpaws. I assume purposefully because he hasn't faced a southpaw in about 5 years. Notably, in his recent little run, with wins over Manfredo, Zbik and the like, not one of the boxers were southpaws. Additionally, Arum turned down Lee as opponent in the past because he was a southpaw. (2) He has more world level experience than Junior. He was an Olympian and faced Gennady Golovkin, Alfredo Angulo and Hassan N'Jikam. In the professional ranks, he's been moved slowly, but he's still been in tougher than Junior. (3) At 27, he's the freshest of any Junior's recent opponents.

Junior's advantages are his brute strength, his size (corrolary of the strength) and his chin.

Lee's not hyper fast, but he's not slow. He's probably average on speed. He has enough pop to keep his opponents honest.

My initial thoughts are that Lee may be able to outbox Junior and Junior may be able to make Lee uncomfortable by crowding him and forcing the action. It's a good fight. What are the opening odds?