Mercury has an equatorial diameter of about 4,880 kilometers. If you are looking for a planet that has a diameter approximately 10 times larger than Mercury, that would be the planet Jupiter. Jupiter has an equatorial diameter of about 139,820 kilometers, which is roughly 28.6 times larger than Mercury. So while Jupiter fits your criteria, it is actually more than 10 times larger.
If you want a planet that is around 10 times larger than Mercury, you could look at Saturn, which has an equatorial diameter of about 116,460 kilometers (about 23.8 times larger). To be exactly 10 times larger, you would need to calculate the corresponding diameter based on Mercury's size, which would be about 48,800 kilometers. There isn't a specific planet that has that size; most planets have significantly larger diameters.
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