It had been speculated for weeks, since players began rotating with the first-team offense during spring practices, that the Buffalo Bills' starting right guard job was up for grabs. Doug Marrone confirmed as much on Wednesday, following his team's fourth training camp practice of the 2014 season.

Doug Marrone asked if starting right guard spot is up for grabs. "Yes it is," he says. — Mike Rodak (@mikerodak) July 23, 2014

As was the case in mid to late June, when the right guard rotation first began, the two players that took reps with the first-team offense in that slot were incumbent starter Kraig Urbik and converted tackle Chris Hairston, who missed the entire 2013 season with an undisclosed illness. Other players may eventually find themselves in the mix, but for now, Urbik and Hairston are the principal contenders.

Meanwhile, Erik Pears and Cyrus Kouandjio continue to duke it out for the right tackle job (Pears has a clear lead early in camp), and the left tackle situation will be largely unsettled until whatever ails Cordy Glenn stops preventing him from practicing (Seantrel Henderson has been his replacement). Which means, four days into Bills training camp, the only two line positions at which there is clarity are center (Eric Wood) and left guard (Chris Williams).

From our unofficial depth chart page, here's what the Bills' depth looks like up front today, with some help from Mark Gaughan of The Buffalo News.