Michael Phelps continued his gold rush Wednesday, winning two more gold medals and smashing two world records.

The wins - his 10th and 11th career golds - make him with winningest Olympian in history. As the announcer at the National Aquatics Center declared, that makes him "arguably the greatest Olympian of all time." (The comment earned a smile from Phelps, who remained stoic for most of the day's competition.)

The day began less than auspiciously, when Phelps's goggles filled up with water during the 200-meter butterfly. The 23-year-old still won handily - in a world-record time of 1:52.03 - but he was visibly annoyed after he touched the wall.

"I couldn't see anything for the last 100 [meters]," Phelps said afterward. "It just kept getting worse and worse through the race."

Although he was disappointed in his time, Phelps begrudgingly admitted, "for the circumstances, I guess it's not too bad."