The 2025 edition Chargers Training Camp kicks off Thursday.

Rookies and select players reported for camp Saturday while veterans rolled into The Bolt on Wednesday.

Time is now ticking for the Bolts, who play their first preseason game — the 2025 Hall of Fame Game — in just 15 games.

With that in mind, here are five key position battles to watch in the coming weeks:

1. Interior offensive line

We'll start with an obvious one here.

As camp looms, it seems as if the open left guard and center jobs will be filled by Zion Johnson and Bradley Bozeman. But it's unclear which player will earn which spot.

"The guys I said that were starting a few, maybe a month or two ago, are in some combination," Chargers Head Coach Jim Harbaugh said last month. "Zion and Boze have been doing what we had foreseen. That's working out really well."

Johnson was the Chargers starting left guard the past two seasons but has transitioned to center. Bozeman started every game at center for the Bolts in 2024 but have previous career experience at left guard.

Harbaugh said in June that he usually prefers to get eight to 10 days into training camp before trying to nail down a starting five combination.

"[That] historically is when I typically like to start setting the starting lineups," Harbaugh said. "From now until then, the competition will continue."

If that's the case, look for the Bolts to settle on an initial starting five sometime soon after the Chargers return from Canton, Ohio.

But what if another player emerges as a potential starter up front?

Trey Pipkins II and Jamaree Salyer could potentially factor in at guard while newcomer Andre James worked at both center and left guard during spring practices.

2. Cornerback

There's an old adage about how NFL teams can never have enough cornerbacks on the roster.

Well, the Chargers enter training camp with a bevy of them and only a certain amount of starting spots available.

Tarheeb Still and Cam Hart are back after promising rookie seasons while the duo of Ja'Sir Taylor and Deane Leonard are each entering their fourth season.

The Chargers also signed Donte Jackson and Benjamin St-Juste in free agency before they used a seventh-round draft pick on Trikweze Bridges.

Chargers Defensive Coordinator Jesse Minter recently compared that group to a different sport with an interesting analogy.

"I think at corner nowadays sometimes you're trying to create a little bit of a basketball team, where you can match up differently on different people," Minter said.

Each of the seven aforementioned cornerbacks present a unique skillset. Some are bigger bodies and offer a more physical style of play while others are shiftier and can work out of the slot.

And keep in mind that safety Derwin James, Jr. thrived near the line of scrimmage last season, which adds another piece to the puzzle in the secondary.

All in all, expect a fierce competition for both starting and reserve roles alike over the next few weeks.

3. Wide receiver

The Chargers actively invested in their wide receiver room this offseason, bringing back Mike Williams and drafting Tre' Harris (second round) and KeAndre Lambert-Smith (fifth round).

Chargers wide receivers coach Sanjay Lal said that's the nature of life in the NFL.

"Every year they're going to bring competition in. That's their job, that's our job. It just raises the level of everyone's play," Lal said.

But that approach has also created a plethora of bodies in the group with limited roster spots available.

Ladd McConkey is poised to be one of Justin Herbert's top targets again after a historic rookie season. Quentin Johnston made tangible strides in Year 2 but the Chargers are also looking for continued progression from the former first-round pick.

Derius Davis is likely a lock to make the roster given his prowess as a returner on special teams. Add in the trio of Williams, Harris and Lambert-Smith — plus two returnees in Jalen Reagor and Brenden Rice — and that makes eight wide receivers to watch in camp.

Padded practices and preseason games will be crucial in determining how this position room shakes out.

4. Linebacker

Daiyan Henley is a crucial piece of the Chargers defense and is also on the cusp on NFL stardom. We aren't worried about him here.

But it will be intriguing to see who wins the starting spot next to Henley in Minter's defense.

Veteran Denzel Perryman is a candidate here as he started 11 games as a season ago. Troy Dye, who returned to the Chargers in free agency, filled in with five starts of his own.

But all eyes will be on Junior Colson, a 2024 third-round pick who endured an up-and-down rookie season due to a variety of injuries, including an appendectomy before camp started a year ago.

Harbaugh and Minter know Colson well from their time together at Michigan. If Colson stays healthy, perhaps he takes a Henley-like leap of his own in his second season.

"He's back in the place I know him to be," Harbaugh said of Colson this offseason. "Which is key performance indicators-all 5/5s, all A+'s across the board.

"He's on a good run, he's gotta stay on that cutting edge, that place. But it's been ascending, arrow up. Back to where he was physically on a consistent basis," Harbaugh added.

5. Defensive tackle

The Chargers revamped their defensive line room in recent months.

While some key contributors from last season are gone, the Bolts replenished the room with the likes of free agents Da'Shawn Hand and Naquan Jones.

The Chargers also spent a third-round pick on defensive tackle Jamaree Caldwell, who is 6-foot-2 and 332 pounds.

"We traded maybe one or two guys for two or three guys," Minter said.

Teair Tart returns from a season ago, as are Otito Ogbnnia, Scott Matlock and Justin Eboigbe, who was a fourth-round pick last year.

Players rotated around in different roles in spring practices but it's always tough to glean anything from the trenches in non-padded sessions.

But now is the group's time shine and see which players can elevate themselves before the 2025 season starts in Brazil.