China (29), the United States (22), and Japan (17) command the 2020 Olympics gold medal count leaderboard following this past weekend's events, and the action will continue in Tokyo on Monday. Track and field highlighted Sunday's action. Puerto Rico's Jasmine Camacho-Quinn raced to an Olympic record in the women's 100-meter hurdles, while Italy's Lamont Marcell Jacobs took home the gold in the men's 100-meter dash. The United States's Caeleb Dressel wrapped up the weekend with his fifth gold medal. More excitement is sure to come in the first week of August, and several events have favorable betting lines.

One event worth keeping an eye on is the women's javelin. It will begin at 8:20 p.m. ET on Monday. Caesars Sportsbook lists Lu Huihui and Christin Hussong as +275 favorites in its latest 2020 Tokyo Olympics odds. However, three other throwers in the top five have a fighting chance. Before locking in any 2020 Tokyo Olympics picks or predictions for those events or others, you need to see what SportsLine Olympics expert Mike Tierney is saying.

A national sportswriter whose work appears in The New York Times and Los Angeles Times, Tierney has covered nine Olympic Games in person. In the past two Olympic Games, his advice helped those who followed him cash in big, and he already has nailed a huge winner at Tokyo 2020.

Tierney kicked off his Olympics 2020 picks by taking Norway's Kristian Blummenfelt (+600) as his pick to win gold in Sunday's men's triathlon, and the 27-year-old ran away with the event. He also picked Chinese legend Long Ma (+163) to win the men's table tennis final over ITTF world No. 1 Fan Zhendong and called Japan (+100), upsetting Team USA in the softball final.

At the Pyeongchang Winter Olympics in 2018, he nailed Suzanne Schulting (+2500) of the Netherlands and Norway's Havard Lorentzen (+800) to triumph in speed skating and the USA's Mikaela Shiffrin (+185) to win the giant slalom. Tierney also took the under (10.5) on the Americans' gold-medal count, and that also cashed as the USA came in with nine.

And at the Rio 2016 Summer Games, Tierney told readers to bet over on Team USA's gold medal count (41.5) and over on Team USA's overall medal count (102.5). The result? 46 golds, 121 medals and two easy cashes. Anyone who followed Tierney's advice cashed in huge.

Now, Tierney has been studying the 2020 Tokyo Olympics event schedule and digging down into individual and team sports. He has released two confident Olympic best bets for Monday. He's only sharing his expert Olympics 2020 picks at SportsLine.

Top 2020 Tokyo Olympics predictions

One giveaway: Poland's Maria Andrejczyk (+300) has the second-best odds to win the gold medal for women's javelin and is worth taking a flier on. The 25-year-old has thrown further (71.4 meters) than any other competitor in the field. A shoulder injury contributed to a fourth-place finish at Rio in 2016, but improved health makes her a strong candidate to contend for gold in Tokyo. 

Andrejczyk has beaten Hussong in each of the last three competitions they've both been a part of, so there's a good chance she can take down one of the favorites again. Tierney thinks that Andrejczyk is in peak shape and that could prime her for a breakout performance. It'll be hard to find a better plus-money option than this.

How to make 2020 Tokyo Olympics picks

In addition to backing a slight underdog in the women's javelin, Tierney has locked in two other best bets for this week's Olympic events. He's only sharing his Olympics 2020 picks at SportsLine.

What underdog seems likely to cover the spread in men's basketball? And what boxing oversight should you attack? Visit SportsLine now to get Mike Tierney's best bets for the Tokyo Summer Olympics, all from the renowned sportswriter who's covered nine Olympics in person and cashed big in both 2016 and '18, and find out.