Question: Who had the highest singles ranking Tomáš Šmíd or Ross Case?

Context paragraphs:
1983 Bavarian Tennis Championships: The 1983 Bavarian Tennis Championships was a men's Grand Prix tennis circuit tournament held in Munich, West Germany which was played on outdoor clay courts.  It was the 67th edition of the tournament and was held form 16 May through 22 May 1983.  Tomáš Šmíd won the singles title.

1984 French Open – Men's Doubles: The Men's Doubles tournament at the 1984 French Open was held from 26 May until 10 June 1984 on the outdoor clay courts at the Stade Roland Garros in Paris, France.  Henri Leconte and Yannick Noah won the title, defeating Pavel Složil and Tomáš Šmíd in the final.

Tomáš Šmíd: Tomáš Šmíd (born May 20, 1956 in Plzeň) is a former tennis player from Czechoslovakia, who won nine singles titles during his career.  In doubles, he won fifty-four titles and was World No. 1 in doubles from December 17, 1984 to August 11, 1985.  The right-hander reached his highest ATP singles ranking of World No. 11 in July 1984.  Šmíd participated in 31 Davis Cup ties for Czechoslovakia from 1977–1989, posting a 20-10 record in doubles and a 22-15 record in singles.

ATP Luxembourg: The ATP Luxembourg is a defunct tennis tournament that was played on the Grand Prix tennis circuit for one year in 1984.  The event was held in Luxembourg and was played on indoor carpet.  Ivan Lendl won the singles event while Anders Järryd and Tomáš Šmíd teamed-up to win the doubles event.

1989 Geneva Open – Doubles: Mansour Bahrami and Tomáš Šmíd were the defending champions, but Šmíd did not participate this year.  Bahrami partnered Guillermo Pérez Roldán, finishing runner-up.

1990 Athens Open – Doubles: Claudio Panatta and Tomáš Šmíd were the defending champions, but did not participate this year.

John Letts (tennis): John Letts (born May 11, 1964), is a former professional tennis player from the United States.  He enjoyed most of his tennis success while playing doubles.  During his career, he won seven ATP tour doubles titles and reached four ATP tour doubles finals.  He also reached the quarterfinals of the 1985 Australian Open in doubles knocking out the 3rd seeded team of Tomáš Šmíd and John Fitzgerald in the second round.

Ross Case: Ross Case (born 1 November 1951) is an Australian former tennis player.  His career-high singles ranking was world no. 14.

1990 Monte Carlo Open – Doubles: Tomáš Šmíd and Mark Woodforde were the defending champions, but Woodforde did not participate this year.  Šmíd partnered Petr Korda.

1984 Bavarian Tennis Championships – Singles: Tomáš Šmíd was the defending champion, but lost in the first round this year.

Supporting paragraphs: Tomáš Šmíd Ross Case
Answer: Tomáš Šmíd