Week 1 of the 2019 NFL preseason is now in the books, and with it came a number of standout performances from both established and under-the-radar players. Here are our takeaways from the first week of preseason.

PFF's Daniel Rymer explains how DeMarcus Walker's strong start to the preseason could earn him meaningful snaps in the regular season.

Despite switching to cornerback after playing safety in college, Marvell Tate III impressed in his preseason debut.

PFF's Ben Linsey examines Jimmy Garoppolo's unusual practice Wednesday and if it means anything for either him or the 49ers' secondary.

PFF picks the defensive players who could use a big game in Week 2 of the 2019 NFL preseason.

PFF picks the offensive players who could use a big game in Week 2 of the 2019 NFL preseason.

After taking Dante Pettis in the second round in 2018, the 49ers bolstered their receiving corps with Jalen Hurd and Deebo Samuel in 2019.

Lane Johnson and Jason Peters have the tackle positions easily locked up, but Andre Dillard's early success bodes well for the future.

David Montgomery's elusiveness at Iowa State was unquestionable. Now, he looks to do the same with the Chicago Bears.

Devin Bush's performance against the Tampa Bay Buccaneers wasn't the well-rounded effort he frequently put together in college, but it was impressive nonetheless.

PFF data scientists Eric Eager and George Chahrouri offer their projections for win totals, Super Bowl odds and division title probability ahead of the 2019 NFL season.

PFF highlights players to watch in all 16 NFL games in the second full week of the NFL preseason.

PFF data scientist Eric Eager details his study of pressures rates and their relationship to quarterback performance in the NFL.

Rookie linebacker Drue Tranquill showed why he was the fifth-ranked linebacker on PFF's Big Board.

The Ravens' young pass-rushing corps is expected to further take shape as the regular season approaches.

While Devin Bush had a solid game in Pittsburgh's preseason opener against the Tampa Bay Buccaneers, it was Ulysees Gilbert III who made the biggest impact in the middle of the team's defense.