The Prefontaine Classic confirmed a sweeping new tranche of entries for its expanded two-day Diamond League meeting at Hayward Field on Wednesday, with Sha'Carri Richardson, Cole Hocker and world indoor 800m record-holder Keely Hodgkinson among the headline names now pencilled in for 3 and 4 July. The 51st edition of the Eugene meeting will run across a Friday evening session and a Saturday afternoon session for the first time, with all 14 Diamond Disciplines staged at Hayward Field.

On the women's sprint side, Olympic silver medallist Sha'Carri Richardson has been confirmed for the 100m on Saturday in a head-to-head with reigning world champion Melissa Jefferson-Wooden, the standout match-up of the meet's main session. The men's 200m delivers another generational clash, with Australian teenager Gout Gout listed alongside Letsile Tebogo and Kenneth Bednarek, and the 110m hurdles drawing Cordell Tinch, Grant Holloway and Daniel Roberts together for a rare in-season rematch.

The middle-distance card continues to be the meet's calling card. Cole Hocker, the Olympic 1500m and world 5000m champion, is back to run a Bowerman Mile that pulls in Australian teenager Cameron Myers and New Zealand's Sam Ruthe, the race's youngest field in years. Faith Kipyegon's previously confirmed appearance in the women's mile remains the centre-piece of the Friday evening session, while the Mutola 800m gives Hodgkinson her first global outdoor outing since her Lievin world indoor record in February.

Field events return in force with Mondo Duplantis already locked in for the men's pole vault and a women's shot put featuring world champion Jessica Schilder. The men's long jump and women's high jump continue to release names, but organisers said both fields would be at "championship level" once finalised. Athletes have been quietly indicating their final season-opening choices over the last fortnight, with Eugene's expanded format absorbing some of the void left by Doha's Diamond League meeting being pushed back to 19 June.

Wanda Diamond League scoring opens at the Shanghai/Keqiao stop on 16 May, but Eugene remains the most lucrative pre-Olympic-cycle dual-day meeting in the calendar with the highest aggregate prize pool of any regular-season fixture. The Prefontaine Classic said additional entries, including in the men's 5000m and women's 1500m, would be released in batches across the next fortnight as the Diamond League season opener gets underway.