The sides met in the first round back in 2004, with Osasuna coming out narrow 1-0 winners after extra time, and despite the gulf in positions on the pyramid, this could go in similar fashion.
Castellon are in superb form in the third tier, but the class of the La Liga outfit should shine through, and last year's finalists are likely to book their place in the fourth round.
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Data Analysis
Our analysis of all available data, including recent performances and player stats up until an hour before kickoff, suggested the most likely outcome of this match was a Osasuna win with a probability of 45.91%. A win for Castellon had a probability of 29.48% and a draw had a probability of 24.6%.
The most likely scoreline for a Osasuna win was 0-1 with a probability of 9.37%. The next most likely scorelines for that outcome were 1-2 (9.29%) and 0-2 (7.51%). The likeliest Castellon win was 1-0 (7.23%), while for a drawn scoreline it was 1-1 (11.58%).
-0.62) 
0.16) 
