Yordano Ventura

Transportation authorities in the Dominican Republic tell TMZ Sports they believe Yordano Ventura was speeding at the time of his fatal crash. The K.C. Royals pitcher was traveling on a mountainous highway around 4 AM on Sunday when he lost control and flipped his customized Jeep ... killing him…

K.C. Royals fans flocked to Kauffman Stadium on Sunday to pay tribute to Yordano Ventura -- the 25-year-old pitcher who was killed in a car crash in the Dominican Republic over the weekend. Flowers, notes, balloons, candles and more were placed around the stadium ... most tributes bearing his…