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The 19-year-old said she has no plans to swap tennis for television.
An 11th straight win of the year also means the Belarusian will return to a career-high ranking of number two behind Iga Swiatek, reaping the rewards of her improved mental stability and service to emerge as a genuine threat in big tournaments.
Sabalenka, the only top-10 seed left in the draw, took her chances in a physical one-hour first set littered with break points before running away with the second.
Garcia, 29, was ranked outside the top 70 in mid-June but has since won four titles, made the semifinals of the US Open and will now rise to a career-high No. 4.
Sakkari is the first player from her group through to the last four.
Sakkari battled past world No. 3 Pegula 7-6(6) 7-6(4) to record her first win over a top-five opponent this year.
Greek fourth seed Sakkari kept alive her hopes of making the Finals by surviving an early scare and fighting back from a set down to beat American Danielle Collins 5-7, 6-3, 6-3.
After a sluggish start, the Pole came alive in the second set and overcame an early break in the decider by winning the final four games to see off the powerful Belarusian.
Not since Andy Roddick in 2003 has a US man won the title at Flushing Meadows and the pressure was on for the 24-year-old Frances Tiafoe to build on his stunning win over second seed Rafa Nadal in the fourth round.
It will be her second straight US Open semifinal after a convincing 6-1 7-6(4) win over the Czech star.