- Andriy Grivko punches Marcel Kittel
- Ukrainian disqualified from Dubai Tour
- Kittel says he 'won't accept apology'
- Follow CNN Sport on Twitter
(CNN)Cyclists are accustomed to fighting for position, but rarely do they fight each other during a high-profile race.
As the wind and sand swirled in the Dubai Tour so too did the red mist for Andriy Grivko, who left race leader Marcel Kittel bloodied, with the German accusing the Ukrainian of landing a punch on him during the third of five stages.
Germany's Kittel, winner of the opening two stages and the defending champion, said on Twitter that Grivko's actions were a "shame on our beautiful sport."
'Unsportsmanlike and unacceptable'
"When we passed a construction site, the sand began blowing and as soon as we went into the crosswinds we were fighting for position, which is always stressful, and Andriy Grivko punched me," the Quick Step Floors rider added on his team's website.
"I get that riding in the crosswinds is always tense, but it gives him no right to act like that. He could have hurt my eye.
"I won't accept an apology. That has nothing to do with cycling."