By now you know that 19-year-oldDodgers left-hander Julio Urias will make his major league debut tonight against the Mets.Urias'fastball tops out at around 97 mph, but thehype surrounding him on social media is traveling much faster.MORE: Struggling aces worth the worry? | Yasiel Puig pulled from game for https://www.marlinsedge.com/miami-marlins/giancarlo-stanton-jersey being PuigBefore throwing his first pitch, Urias isalready being anointed Clayton Kershaw'sheir apparent as baseball's best pitcher.By the time Uriastakes the mound tonight, some may be calling the legendary Sandy Koufax a poor man's Julio Urias.As Los Angeles Times sportswriter Houston Mitchell quipped in his notebookFriday morning, "With the way social media has been reacting, I'm wondering if it is too soon to retire Julio Urias' number."Fox Sports'Ken Rosenthal said former Dodgers pitcher ZackGreinke called Uriasthe most perfect pitching prospect I've ever seen.Peter Gammons went back 40 years to find a good comparison, citing Frank Tanana, Nolan Ryan's old running mate with the California Angels.Per Julio Urias's debut, I think of the young,pre-injury Frank Tanana, who at https://www.marlinsedge.com/miami-marlins/wei-yin-chen-jersey ages 21-23 was 98-59, 2.53, 735 K, 207 BB on a bad Angel team Peter Gammons (@pgammo) May 27, 2016Deadspin tweeted, "Hell yeah, Julio Urias is coming."ESPN compared Urias to former Dodgers great Fernando Valenzuela, because of some obvious similarities: They're both short left-handers from Northern Mexico who debuted at age 19. But statistically, they said Urias'numbers so far match up to Kershaw's minor league statistics. Kershaw had the edge in ERA, but Urias had better WHIPand strikeout-to-walk ratio numbers.MORE: Not every great player wins title, but Mike Trout still has timeBeckett Media is already speculating on which Urias rookie card to put away for investment purposes.2013 Bowman Sterling or 2014 Bowman Chrome Autograph – which Julio Urias would you pick? https://t.co/cLPCzBe1Fx pic.twitter.com/AnKuj2l4Xf Beckett Media LLC Jose Fernandez Jersey (@beckettmedia) May 18, 2016MLB Network's Jon Heyman tweeted, "When I saw him in spring, looked like a very young David Price."Of course, we won't know how good Urias is until he's got a few appearances under his belt. But we'll get our first look tonight."God gave me a bad left eye but a good left arm." Happy Julio Urias day, everyone! pic.twitter.com/aRuPjen0Sf Molly Knight (@molly_knight) May 27, 2016Until then, as veteran baseball writer Molly Knight Tweeted, "Happy Julio Urias Day, everyone!"