Answer based on context:

Looking for their first win of the season, the Dolphins traveled to Qualcomm Stadium to take on the San Diego Chargers. After a scoreless first quarter, Nate Kaeding hit a 25-yard field goal to score the first points of the game. Miami would answer with a 24-yard field goal to tie the game at halftime 3-3. Miami would then take the lead after a 23-yard field goal by Dan Carpenter. But the Chargers would retake the lead with a 5-yard touchdoun run by Philip Rivers. The Chargers would pull away in the fourth quarter with two Nate Kaeding field goals and a 31-yard interception return by safety Eric Weddle. The Dolphins would get a 14-yard touchdown run by Ricky Williams, but couldn't make a comeback. The Chargers won the game 23-13 as the Dolphins fell to 0-3. Dolphins quarterback Chad Pennington left the game with a shoulder injury after being hit by linebacker Kevin Burnett and was out for the season. The Dolphins chose Chad Henne to lead the Dolphins for the rest of the season.

Who had the first TD run of the game?
Philip Rivers