The redesigns mesh with Yahoo's new homepage and news site, which were revamped earlier this year.
Yahoo Sports is simplified and hopes to do a better job at surfacing "what's most important to fans: original content, scores, video, news and your fantasy teams," Yahoo said. The company has also redesigned live box scores with in-line tweets.
Yahoo Finance also hopes to be easier to read with bigger headlines and photos and fewer modules. For example, your watchlist, portfolios and popular market data have been combined into one dashboard that users can add, remove and reorder. This makes some room for topic-specific "news clusters" that are based on stories you've read or liked and now have easier sharing options.
"The new designs will create a more consistent experience on Yahoo -- across all platforms -- with an emphasis on content, communities and utility," said Michael La Guardia, who heads up Yahoo Sports and Finance.
Last week Yahoo launched a new Sports app for iOS and Android and Facebook Messenger bots that you can "chat" with to bring you news and weather information.