Ferrari's Felipe Massa has had surgery after a big crash during qualifying for the Hungarian Grand Prix.
Massa hurt his head badly when a small part of another car flew up off the track and struck him on the helmet. He then crashed into a tyre barrier.
The Brazilian driver's team says Massa is "stable" which means that he isn't getting any worse.
Formula One bosses say they are going to investigate the incident to find out how it happened.
Ferrari say Massa will have another scan on Sunday.
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Doctors say they are pleased with how Massa has responded to his operation and his condition overnight.
The race itself starts at 1pm on Sunday. Spain's Fernando Alonso will start the race from pole position after setting the quickest time in qualifying.
Lewis Hamilton will start from fourth on the grid and championship leader Jenson Button from eighth.