RIO DE JANEIRO – A valiant effort by Allyson Felix to overcome an ankle injury that threatened to derail her Olympic dreams months before she reached Rio wasn’t quite enough for her to win gold in the women’s 400-meter dash on Monday night, when Shaunae Miller of the Bahamas dived at the line and won the race by perhaps half an arm’s length.

Miller won with a time of 49.44 seconds, to a season-best 49.51 for Felix, who grew up in Los Angeles and attended USC. Shericka Jackson of Jamaica was third in 49.85.

No one was initially sure who had won. Miller, gasping for air after holding off Felix’s late surge, fell forward onto the track and rolled over onto her back. Felix sat on the track, arms clasped around her knees, as she looked to the scoreboard for the result.

The crowd at Olympic Stadium let loose a roar when Miller’s name was listed first, followed by Felix.

Felix won the gold medal in the 200-meter dash at the London Games four years ago and had hoped to pursue a 200-400 double here. However, a training accident that damaged ligaments in her ankle in late April led her to struggle at the U.S. Olympic trials and she didn’t make the team in the 200 and so was unable to defend her title. However, she is expected to run both the 400-meter and 1,600-meter relays here.

Running in Lane 4 on a track dampened by rain that had delayed the start of several races, she made a strong surge down the stretch and appeared in position to win. But that’s when Miller made her desperate and successful dive and came up a winner.

US men’s volleyball advances

Current men’s volleyball Olympic champions and medal favorites United States won the chance to defend their title by securing a quarter-final slot with a 3-0 victory over Mexico on Monday.

The U.S. has clawed back from the brink of elimination after losing its first two games to Canada and Italy and began its comeback with a stunning 3-1 win over hosts Brazil.

United States overwhelmed the last-placed Mexicans in straight sets (25-23, 25-11, 25-19) in their last preliminary game and is guaranteed a place in the quarter-finals.

The Americans were tied with France, Canada and Brazil with six points before Monday’s victory, but Brazil must play France and Canada face group leaders Italy on Monday night.

After upsetting Brazil, U.S. overpowered France in four sets on Saturday, putting the Americans on a roll for an easier encounter with Mexico.

US coach angered by boxing judging

U.S. coach Billy Walsh questioned the judging after his lightweight Mikaela Mayer lost her quarterfinal on points to Russian Anastasia Beliakova at the Rio Games on Monday.

“To be honest, I’ve just had a look at the judging. It was crazy,” Walsh told reporters. “Are they looking at the same bloody fight or what?

“Her performance was excellent, she gave everything she had … I thought she did enough to win it.”

The judges’ tallies showed that one had scored the fight as a 38-38 draw while the other two came down 39-37 on the side of the Russian, who won 2-0 and is now assured of a bronze medal for reaching the last four.

All three judges awarded at least one round to Mayer, however.

Mayer, one of two U.S. women in the Rio boxing tournament with the other being reigning middleweight champion Claressa Shields, felt she could have swung it with a few more combinations.

“It was a close fight so it makes it even more disappointing,” she said.

“I thought I might have pulled it off at the end but … I also know this is boxing. If you let a fight get that close, you don’t know who they are going to give it to.”

Russian runner fears for life

The Russian runner who helped expose a system of state-backed doping in her country says she fears for her life and has been forced to move after hackers tried to find her location.

The World Anti-Doping Agency (WADA) said on Saturday Yulia Stepanova’s online doping management account had been illegally accessed. The doping scandal she lifted the lid on has rocked sport and cost over 100 Russians their place at the Rio Games.

Stepanova has been in hiding in the United States with her husband Vitaly, a former Russian anti-doping official, after giving evidence that the Russian government for years facilitated widespread cheating across nearly all Olympic sports.

Speaking to journalists on a video conference call just days before the 800 metres final in Rio, which she has been barred from running in following the suspension of Russian track-and-field from international competition, Stepanova said she had moved her family to another location after the hack.

“The only reason somebody would hack an ADAMS account is to find out your exact location,” she said. “We decided it was safer to relocate.

“If something happens to us then you should know that it is not an accident.”

All athletes have to enter their details into WADA’s Anti-Doping Administration and Management System (ADAMS) and register a time and location each day where they can be reached by doping testers for an out-of-competition test.

Stepanova and her husband have repeatedly raised concerns about their safety in light of the doping scandal they helped ignite and criticized the International Olympic Committee for not doing more to support whistleblowers.

Vitaly Stepanov said he did not know who had hacked his wife’s account but said the couple were being watched by Russian authorities.

After she initially fled Russia for Germany, Russian sports officials said they did not know about any threats against Stepanova or her husband that could have compelled them to seek refuge abroad.

Stepanova said attending the Games — she and her husband declined an invitation from Olympic bosses to visit as spectators — would have left her particularly vulnerable.

General worries about safety and violent crime have cast a pall over the Rio Olympics. Most recently, U.S. gold medallist swimmer Ryan Lochte was robbed at gunpoint by men posing as police officers.

“Watching the Olympic Games and reading the news about what is happening there, on some level I’m glad that I didn’t go,” she said. “If someone wanted to hurt us, it would be very easy to do it there.”

Tishchenko wins heavyweight gold

Russia’s Evgeny Tishchenko won the Olympic heavyweight boxing gold medal to a chorus of boos from the crowd on Monday after beating Kazakhstan’s Vasily Levit on a unanimous points decision.

Levit, whose taller and longer-reached opponent required medical attention for a cut in the third and final round and who had been backed repeatedly on to the ropes, took the silver medal.

The bronze medals went to losing semifinalists Rustam Tulaganov of Uzbekistan and Erislandy Savon of Cuba.

The majority of the audience, in a Riocentro arena that was barely half full, reacted to the score announcement with derision while a pocket of Russian fans waved flags and celebrated.

The judges scorecards had Levit narrowly ahead after the first round, with two out three giving it to the Kazakh, but they were unanimous in giving the second to the Russian.

Levit came on strong in a scrappy third round, with both men hitting out wildly and Tishchenko slipping and losing his balance.

The referee called a halt with 51 seconds remaining for inspection of a cut, before the fight resumed and ended in a flurry of punches.

Russian athletes have been regularly booed in Rio as a result of the country’s doping scandal that has overshadowed the Games.