Boston then tied the game n the bottom of the first inning, scoring all six runs against NY starter Masahiro Tanaka who lasted only two outs before being removed.
"Harry said they had a sleepless night", she added.
Harry threw out the first pitch of the series, hosted in partnership with the Invictus Games Foundation.
"You guys have beaten next door's present, by the way", he told the team.
Firstly the Boston Red Sox gave over a bag of team-branded goodies for the baby boy to his parents, Prince Harry and Meghan Markle.
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The loan agreement included an option to purchase him on a permanent basis for a fixed fee of €34 million (around £30 million). Aubameyang has been touted as a target for a number of clubs as Arsenal look to bolster their transfer budget.
The duchess looked effortlessly stylish in a belted Stella McCartney dress which she matched with a pair of black flats.
Although the royal parents were seen without their little bundle of joy, they did receive adorable outfits for the little one from both teams, including a Yankees jersey with his name printed on it.
Former competitors in the Invictus Games, an global sports competition for injured military personnel which the duke helped set up, started the match by throwing the first pitches.
The Royals appeared to promote the Invictus Games Foundation, which Prince Harry founded.
Meghan is expected to be on maternity from her offical royal duties for several more months, before the family embark on a tour of southern Africa.
In Game 1 of the London Series between the Yankees and Red Sox, the game started off nutty and ended even nuttier.
It is the first Major League Baseball (MLB) game played in Europe, and will be watched by a large audience of eager baseball fans back in the US.