Martin Buser

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Martin Buser (15) drives his team down the start chute of the 45th Iditarod Trail Sled Dog Race in Fairbanks, Alaska, Monday, March 6, 2017. Buser is one of 5 four-time Iditarod Champions competing in the 2017 Iditarod Trail Sled Dog Race. (AP Photo/Ellamarie Quimby)

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Village children watch as Iditarod musher Martin Buser, from Big Lake, Alaska, cares for his dog team at the Koyuk checkpoint during the 2014 Iditarod Trail Sled Dog Race on Sunday, March 9, 2014. (AP Photo/The Anchorage Daily News, Bob Hallinen)

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Martin Buser is second into the Unalakleet checkpoint during the 2014 Iditarod Trail Sled Dog Race on Saturday, March 8, 2014. (AP Photo/The Anchorage Daily News, Bob Hallinen)

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Martin Buser changes his drag brake onto his coast sled. Buser has his finger taped up because it keeps popping out of joint. Buser was second into the Unalakleet checkpoint during the 2014 Iditarod Trail Sled Dog Race on Saturday, March 8, 2014. (AP Photo/The Anchorage Daily News, Bob Hallinen)

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Martin Buser has breakfast and checks the race standings in the school cafeteria at the Nikolai, Alaska, checkpoint during the Iditarod Trail Sled Dog Race on Tuesday, March 4, 2014. (AP Photo/Anchorage Daily News, Bob Hallinen)

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Martin Buser, left, shows his swollen ankle to Aaron Burmeister in the school cafeteria during the 2014 Iditarod Trail Sled Dog Race on Tuesday, March 4, 2014, in Nikolai, Alaska. The swelling of Buser’s ankle has gone down after a short rest at the Nikolai checkpoint. Burmeister injured his knee about 18 miles past the Rohn checkpoint on the snowless Farewell Burn. His knee popped out and he had to tape it up so it would stay in place. (AP Photo/The Anchorage Daily News, Bob Hallinen)

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In this March 3, 2014 photo, Martin Buser mushes across the snowless Farewell Burn in Alaska, during the 2014 Iditarod Trail Sled Dog Race. (AP Photo/The Anchorage Daily News, Bob Hallinen)

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Martin Buser mushes across the virtually snowless Farewell Burn during the 2014 Iditarod Trail Sled Dog Race on Monday, March 3, 2014. Four-time champion Buser is holding on to his lead in the Iditarod Trail Sled Dog Race. (AP Photo/The Anchorage Daily News, Bill Hallinen) LOCAL TV OUT (KTUU-TV, KTVA-TV) LOCAL PRINT OUT (THE ANCHORAGE PRESS, THE ALASKA DISPATCH)

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Martin Buser mushes across the virtually snowless Farewell Burn during the 2014 Iditarod Trail Sled Dog Race on Monday, March 3, 2014. Four-time champion Buser is holding on to his lead in the Iditarod Trail Sled Dog Race. (AP Photo/The Anchorage Daily News, Bill Hallinen) LOCAL TV OUT (KTUU-TV, KTVA-TV) LOCAL PRINT OUT (THE ANCHORAGE PRESS, THE ALASKA DISPATCH)