DAVIE, Fla. – A daily review of the hot topics coming out of Miami Dolphins training camp:

It was another sloppy day for the offense. The Dolphins are experiencing growing pains learning an up-tempo scheme under first-year coordinator Bill Lazor. This was one of those sessions where the Dolphins had poor throws, numerous drops and offensive line issues. I counted at least five drops by Miami receivers in what was probably the worst practice by the offense since the opening day of training camp. "I obviously haven’t looked at the film yet, but my instincts tell me that the defense had the upper hand," Dolphins coach Joe Philbin admitted.

The center position is starting to become a major concern. For the second day in a row, Shelley Smith had two errant snaps to quarterback Ryan Tannehill. The second bad snap was a ground ball that skipped past Tannehill in team drills. Soon after, backup center Nate Garner finished practice on the first team. Miami tried several different combinations in an effort to find the best five on the line. In addition to Garner, rookie guard Billy Turner also worked with the first-team offense at times on Wednesday.

The play of the day goes to Dolphins wide receiver Brian Hartline. Early in team drills Hartline beat cornerback Jamar Taylor deep for a 60-plus yard touchdown reception. Miami’s offense protected Tannehill enough for him to throw a pretty deep ball that Hartline caught in stride. To Taylor’s credit, he responded with an interception of Tannehill and had a couple of tipped passes.

The three punt returners Wednesday were receivers Marcus Thigpen, Jarvis Landry and Rantavious Wooten. Thigpen is the incumbent but must compete to keep his job with punt and kick returns.