Jaylen Brown signs richest NBA contract and Justin Herbert becomes highest-paid NFL quarter-back

NBA player Jaylen Brown and NFL quarterback Justin Herbert have both signed historic deals

Kylian Mbappe may be about to become the most expensive footballer of all time - but in the United States two financial records have just been smashed.

Jaylen Brown has signed the richest deal in NBA history, agreeing a $304m (£236.8m) contract to remain at Boston Celtics, according to reports.

Meanwhile, Justin Herbert's new five-year, $262.5m (£203.6m) extension with the Los Angeles Chargers will make him the NFL's highest-paid quarterback by annual salary, insiders say.

Brown's five-year Celtics contract exceeds reigning NBA Finals Most Valuable Player Nikola Jokic's $264m (£204.9m) deal at Denver Nuggets, which he signed last summer.

The two-time All-Star, 26, averaged career bests in points (26.6), rebounds (6.9) and assists (3.5) during 2022-23 as Boston reached the Eastern Conference finals.

Brown will earn $28.5m (£22m) next season before his extension begins in 2024, when he will average $60.8m (£47.1m) per year.

Herbert's Chargers contract surpasses the $52.5m (£40.7m) average annual salary of Lamar Jackson, who signed a five-year, $260m (£201.8m) extension with the Baltimore Ravens this offseason.

The 25-year-old is the only player to top 4,000 passing yards in each of the first three seasons of their career - and no player in NFL history has made more completions (1,316) over the first three campaigns.

However, Cincinnati Bengals quarterback Joe Burrow is due for an extension which could top Herbert's figure.