USC football secondary: Adoree Jackson, Iman Marshall, Kevon Seymour talented but young

30 Key Trojans: #15 Iman Marshall [Shotgun Spratling, USCFootball.com]: "Our countdown of the 30 key Trojans for 2015 continues with a freshman that could make an instant impact, but has to deal with a lot of expectations. "

John Plattenburg has emerged as one of the leaders of the USC secondary [Garry Paskwietz, WeAreSC.com]: "Though he is only a sophomore, the 5-foot-11, 185-pound Plattenburg has quickly emerged as one of the leaders of the defense and brings a maturity to the secondary."

Alert: USC's 'intense' first day in pads [Ryan Abraham, USCFootball.com]: "True freshman safety Marvell Tell made an impact Monday picking off Max Browne. "

USC freshman Iman Marshall to play cornerback as defense starts to come together [Scott Wolf, Inside USC]: "Freshman Iman Marshall is officially a cornerback, which means the nickel defense will likely feature Marshall, Adoree Jackson and Kevon Seymour. "

Q&A with Keith Heyward [Chris Swanson, USCFootball.com]: "Keith Heyward is confident that USC's safeties will improve. "

Trojans In The Zone: Tuesday's Impact Players [Trajuan Briggs, Conquest Chronicles]: "Senior cornerback Kevon Seymour looked like an absolute ball player in drills and competition. Seymour played very physical and matched up with the receivers quite well, usually coming out on top in one on ones."

Video: Sark post-practice Monday [TrojanSports.com]: "Steve Sarkisian touches on the passing of Frank Gifford, the play of cornerback Iman Marshall and also gives an injury update on two freshmen."

Trojans In The Zone: Tuesday's Impact Players [Trajuan Briggs, Conquest Chronicles]: "Freshman safety Ykili Ross had an exciting day as he received a lot of reps. Ross had a forced fumble in 7 on 7 that led to a touchdown, which was one of two defensive touchdowns the Trojans scored in that segment."