WARNING: THIS ARTICLE CONTAINS GRAPHIC PHOTOS

A 20-year-old spearfisherman detailed his encounter with a bull shark in the Florida Keys last week as he recovers in a hospital from bite wounds to his leg.

The bull shark, as much as 10 feet long and weighing 500 pounds, "came out of nowhere" and chomped down on his leg twice while he was diving about 70 feet underwater, Kevin Blanco told WSVN-TV from his bed at Jackson South Medical Center in Miami.

"I’ve been in that same situation a lot of times, and they are usually afraid of us," Blanco said. "That one was not afraid of us. He wanted me. It was a scary event."

The shark attacked around 3 p.m. Thursday off the coast of Marathon, the Monroe County Sheriff's Office said in a news release. The victim was brought to shore by a private boat, and a medical helicopter landed on the Seven Mile Bridge to airlift him to the hospital.

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"I’ve been in the water a very long time. I’ve never seen a shark act like this," Blanco said.

Doctors are working to keep Blanco’s wounds free from infection. He is expected to be released in less than a week.

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Less than 36 hours after Blanco’s shark encounter, another shark bit a 35-year-old fisherman on the foot in Summerland Key, the sheriff’s office said.

The fisherman had reeled in the shark while fishing off a dock on Saturday. The shark was on the dock when it bit the man, the release said.

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The man was also taken to by a trauma helicopter to a hospital in Miami. No update on his condition was immediately available.

The Associated Press contributed to this report.

Earlier his year, Tennis legend Martina Navratilova announced that she had been diagnosed with throat and breast cancer. 

Now, the 18-time Grand Slam champion says she is doing "OK," just two months after revealing that she is cancer-free. 

Navratilova, 66, provided the update at the Italian Open on Sunday after she was awarded the Golden Racket for contributions to the sport. 

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"I've gone through a very difficult year, but now I'm OK," she said as she gave her speech on the clay court. 

Navratilova announced her diagnosis in January. She said she had found a lump on her neck in November and while undergoing testing, it was also discovered that her breast cancer had returned. 

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She underwent treatment, and in late March, she said during an interview with TalkTV’s Piers Morgan, that she was cancer-free. 

"Tennis gave me a surprising life for which I am very grateful," she added Sunday. "I always tried to give something back when I played, and also in retirement."

Navratilova retired in 1994 but would return to the court years later to play in doubles matches. She has a record 167 singles titles and her 331 weeks at No. 1 in the WTA rankings is the second most of any female pro.

The Associated Press contributed to this report.