Kevonte Martin-Manley returned back-to-back punts for touchdowns;
B.J. Lowery returned a pair of interceptions for TDs and Iowa rolled past Western Michigan 59-3 on Saturday.
The Hawkeyes (3-1) now enter Big Ten play with a three-game winning streak, their longest since 2010.
Martin-Manley scored on returns of 83 and 63 yards early in the second quarter as Iowa jumped out to a 38-3 halftime lead.
Lowery took back picks for 35 and 13-yard TDs for Iowa, which scored its most points since it had 62 against Northwestern in 2002.
Tyler Van Tubbergen had 114 yards passing for the Broncos (0-4).