He's a famous tennis player, coming back to the circuit after taking a break when he lost his wife. She desperately needs a job and a place to stay. He hires her and in spite of himself feels insta-lust. 
Read this book if you like second chance at romance, age gap, single dad, witty banter and an adorable little girl. My only issue with it is where she's just coming out of teenagehood to be this serious right away. Not a deal breaker.
This book is a fresh debut story with brilliant writing.