Garrett McNamara breaks his own mark

Hawaiian surfer Garrett McNamara reportedly broke his own world record by riding a wave estimated to be more than 100 feet high off the coast of Nazaré, Portugal on Monday.

McNamara, a native of Pittsfield, Mass., who moved to Hawaii's North Shore as an 11-year-old boy, set the current Guinness World Record for the largest wave surfed of 78 feet at Nazaré in November of 2011. That ride was originally reported as being more than 90 feet.

A photo claiming to show McNamara near the crest of the giant wave was taken by surf photographer Tó Mané and posted on surfertoday.com. The height of the wave has yet to be independently verified, but surfertoday.com reported Tuesday that the authorities in Nazaré have asked for an independent analysis to confirm the wave's height. The site said that McNamara traveled from Hawaii and was surfing with Kealii Mamala -- with whom he surfed near glaciers in Alaska -- Kamaki Worthington and Hugo Vau.

This stunning video of the surfers in action and the waves crashing along the Portugal coast was posted on YouTube by Coastline Tobi (Tobias Ilsanker) on Monday.

Bill Speros is an ESPN.com contributor. He can be reached on Twitter @billsperos or via e-mail at bsperos1@gmail.com.