Athletics rookie Nick Kurtz is not just in the conversation for the Rookie of the Year anymore, but is instead being pinned as the front-runner after a record-breaking performance against the Houston Astros on Friday.Kurtz has been on a tear since his MLB debut in April, when his family, including his sister Grace Kurtz, were in the stands cheering for the 22-year-old.Grace is an emerging model and walked the ramp for DC Fashion Week at the National Housing Center in October 2023. View this post on Instagram Instagram PostShe is also a horse riding enthusiast. Her passion for the sport was highlighted by her mother, Marie, in an Instagram post, which said Grace had been practicing for 14 years. "So much more than just a horse show... grateful for the #shadesofblue family for another memorable week and @gracekurtzz to 14 years of horse showing experiences! Until next time," Marie wrote at the HITS Culpeper earlier this month. View this post on Instagram Instagram PostShe is represented by Next Management.Nick Kurtz's sister, Grace, reacts to Athletics rookie's historic nightGrace, who was present at Nick Kurtz's MLB debut on April 23 against the Texas Rangers, reacted to her brother's record-breaking night on Friday. Grace shared a graphic of Kurtz's four-homer game at Daikin Park in her Instagram story with a 'surprise' emoji.(Image source - Instagram)Nick Kurtz became the first rookie and the 20th overall player to hit four home runs in a game. He is the second player to go deep four times, the most in a game, this season, joining Arizona Diamondbacks slugger Eugenio Suarez.