Fourhand: Roger Federer vs. Lindsey Vonn atop a Swiss mountain

In this incubator period between Wimbledon and the U.S. Open Series kickoff, we find our favorite stars of tennis searching for ways to elevate or else knock down others. That's what this edition of Fourhand involves, top to bottom. Onward:

WELL HEELED  Caroline Wozniacki seemingly delivered a dig aimed at ex-fiancé Rory McIlroy on Thursday, declaring in an Instagram photo caption that she's happy to be sporting heels on "a normal day out" for the first time in three years. (Of course said normal day out, for Wozniacki, involves shopping at Chanel in Istanbul, Turkey.)

Related: Maria Sharapova scored laughs when she used Floyd Mayweather Jr. as an armrest during the ESPY Awards Wednesday night.

THE ICEMAN COMETH  Roger Federer and one of his celebrity superfans, champion skier Lindsey Vonn, took to a glacier near the Jungfraujoch, known as the "top of Europe" in the Bernese Alps, for a friendly tennis hit. And by "hit," I do mean ... well, just watch:

It's all in the name of sweets, as Federer's Lindt endorsement takes him to the so-called #ChocolateHeaven.

KEEPS GETTING BETTERER  While we're at it, if you haven't yet, do yourself a rather savory favor and watch Fed's recent "Betterer" video from his racqueteer, Wilson Tennis. It's a subtly great, simple clip.

TALL ORDER  That's what beating 6'11" Ivo Karlovic often is, mainly in light of his booming serve. And the relatively dwarfed Dudi Sela, at 5'9", didn't fare well in their latest encounter, dropping (you guessed it) two tiebreak sets to fall short of the Colombia Open quarterfinals in Bogota. He made headlines, though, by pulling up a chair post-match to embrace Karlovic, who he considers a friend.

Got a tip or a point to make? Hit me on Twitter at @jonscott9.