King/Harrison vs Humbert/Fils

King/Harrison would likely be the favorites in this matchup due to their experience and established doubles chemistry. Harrison, in particular, has a wealth of doubles experience and knows how to handle the tactical nuances of the format.

Humbert/Fils might struggle with their lack of consistent doubles experience. While both are talented players, Humbert's main strength lies in singles, and Fils is still developing his doubles game. They could pose a challenge with their athleticism and individual skill, but overall, the pairing may not have the same cohesion as King/Harrison.

King/Harrison would likely be favored to win due to their combined experience and comfort in doubles. That said, if Humbert or Fils has an exceptional day or if they can quickly build chemistry on the court, they could make things competitive.