Oil prices dipped on Monday, pressured by worries over a global glut as escalating US-China trade tensions added to concerns about an economic slowdown and weaker energy demand. Brent crude futures fell 24 cents, or 0.4%, at $61.05 a barrel at 0032 GMT, while US West Texas Intermediate futures were down 21 cents, or 0.4%, at $57.33, erasing gains from Friday.