After defeating Norwegian Casper Ruud in four sets to win the US Open title, Spain's 19-year-old Carlos Alcaraz earned his first grand slam title with the win and will become the youngest world No. 1 in the history of the ATP rankings with the victory. CNN's Carolyn Manno speaks to Alcaraz following his big win at the US Open.

Ben Johns, the world's best pickleball player, walks CNN Sport's Carolyn Manno through the ins and outs of the growing sport, which has roots in tennis, ping pong and badminton.

Serena Williams has announced she will be retiring from tennis after the 2022 US Open. CNN's Christina MacFarlane looks at her journey from teen sensation to being one of the sport's all-time greats.

This month, Ukrainian tennis player Elina Svitolina became an ambassador of UNITED24. Ukrainian President Volodymyr Zelensky launched U24 in the wake of the Russian invasion. The foundation is the main avenue for collecting charitable donations in support of Ukraine's defense.

Air pollution spiked to unhealthy levels around the world in 2021, according to a new report.

Lake Powell, the second-largest human-made reservoir in the US, has lost nearly 7% of its potential storage capacity since 1963, when Glen Canyon Dam was built, a new report shows.

As the US attempts to wean itself off its heavy reliance on fossil fuels and shift to cleaner energy sources, many experts are eyeing a promising solution: your neighborhood big-box stores and shopping malls.