{"id":644597,"date":"2026-06-07T08:29:23","date_gmt":"2026-06-07T15:29:23","guid":{"rendered":"https:\/\/www.swimmingworldmagazine.com\/news\/?p=644597"},"modified":"2026-06-07T08:30:25","modified_gmt":"2026-06-07T15:30:25","slug":"will-mollie-ocallaghan-be-next-star-to-join-51-club-in-100-freestyle","status":"publish","type":"post","link":"https:\/\/www.swimmingworldmagazine.com\/news\/will-mollie-ocallaghan-be-next-star-to-join-51-club-in-100-freestyle\/","title":{"rendered":"Will Mollie O&#8217;Callaghan Be Next Star to Join 51 Club in 100 Freestyle?"},"content":{"rendered":"<p><strong>Will Mollie O&#8217;Callaghan Be Next Star to Join 51 Club in 100 Freestyle?<\/strong><\/p>\n<p>The dynamic of an event can shift quickly, sometimes in a matter of days. Want an example? Look no further than the hierarchy of the women&#8217;s 100-meter freestyle, which offered up a pair of sensational performances in late May. In less than a week, the United States&#8217; <strong>Anna Moesch<\/strong> (51.94) and the Netherlands&#8217; <strong>Marrit Steenbergen<\/strong> (51.86\/51.97) doubled the number of women who have eclipsed the 52-second barrier in the event.<\/p>\n<p>Prior to what Moesch pulled off at the AP Race London and what Steenbergen delivered during the Mare Nostrum Series, only <strong>Sarah Sjostrom<\/strong> (2017) and <strong>Emma McKeon<\/strong> (2021) had gone sub-52. For several years, the event felt stagnant, a clocking of 52.55 enough for gold at last year&#8217;s World Championships in Singapore. Now, there is hoopla surrounding the 100 freestyle, and that hype could grow in the week ahead.<\/p>\n<p>In Sydney this week, the Australian Selection Trials for the Commonwealth Games and Pan Pacific Championships will be conducted. A main storyline from Down Under will surround the 100 freestyle and whether a third athlete will clock sub-52 this year. The leading candidate is undoubtedly <strong>Mollie O&#8217;Callaghan<\/strong>, the 22-year-old veteran of international competition. While O&#8217;Callaghan is the reigning Olympic champion in the 200 freestyle, the Aussie is a two-time world champ in the 100 freestyle (2022\/2023), and was the silver medalist in the event last year.<\/p>\n<p>Known for her back-end speed, O&#8217;Callaghan boasts a career best of 52.08 in the 100 freestyle, so she has knocked on the door to 51-second territory in the past. Perhaps this week is the time she enters the exclusive club. On the way to the 2028 Olympic Games in Los Angeles, another 51-second marker would obviously enhance the new energy surrounding the event.<\/p>\n<p><strong>Top-10 Performers (100 Freestyle)<\/strong><\/p>\n<p>1. Sarah Sjostrom (Sweden) &#8211; 51.71 (2017)<br \/>\n2. Marrit Steenbergen (Netherlands) &#8211; 51.86 (2026)<br \/>\n3. Anna Moesch (United States) &#8211; 51.94 (2026)<br \/>\n4. Emma McKeon (Australia) &#8211; 51.96 (2021)<br \/>\n5. Siobhan Haughey (Hong Kong) &#8211; 52.02 (2023)<br \/>\n6. Cate Campbell (Australia) &#8211; 52.03 (2018)<br \/>\n7. Simone Manuel (United States) &#8211; 52.04 (2019)<br \/>\n8. Britta Steffen (Germany) &#8211; 52.07 (2009)<br \/>\n9. Mollie O&#8217;Callaghan (Australia) &#8211; 52.08 (2023)<br \/>\n10. Bronte Campbell (Australia) &#8211; 52.27 (2018)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Will Mollie O&#8217;Callaghan Be Next Star to Join 51 Club in 100 Freestyle? The dynamic of an event can shift quickly, sometimes in a matter of days. Want an example?<\/p>\n","protected":false},"author":7533,"featured_media":619230,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"dois","enabled":false},"version":2}},"categories":[3,10],"tags":[77839],"class_list":["post-644597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured","category-world","tag-mollie-ocallaghan"],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Will Mollie O&#039;Callaghan Be Next to Join 51 Club in 100 Freestyle?<\/title>\r\n<meta name=\"description\" content=\"The Australian Selection Trials will be held this week and Mollie O&#039;Callaghan could join the 51-second club in the 100 freestyle.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.swimmingworldmagazine.com\/news\/will-mollie-ocallaghan-be-next-star-to-join-51-club-in-100-freestyle\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Will Mollie O&#039;Callaghan Be Next Star to Join 51 Club in 100 Freestyle?\" \/>\r\n<meta property=\"og:description\" content=\"The Australian Selection Trials will be held this week and Mollie O&#039;Callaghan could join the 51-second club in the 100 freestyle.\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/www.swimmingworldmagazine.com\/news\/will-mollie-ocallaghan-be-next-star-to-join-51-club-in-100-freestyle\/\" \/>\r\n<meta property=\"og:site_name\" content=\"Swimming World\" \/>\r\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SwimmingWorld\" \/>\r\n<meta property=\"article:published_time\" content=\"2026-06-07T15:29:23+00:00\" \/>\r\n<meta property=\"article:modified_time\" content=\"2026-06-07T15:30:25+00:00\" \/>\r\n<meta property=\"og:image\" content=\"https:\/\/vmrw8k5h.tinifycdn.com\/news\/wp-content\/uploads\/2025\/07\/OCallaghan_6022-scaled.jpg\" \/>\r\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\r\n\t<meta property=\"og:image:height\" content=\"1707\" \/>\r\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\r\n<meta name=\"author\" content=\"John Lohn - 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